Solution to prize problem listed on page 29 of THE MATHEMATICS CALENDAR 2011 was given by David Johnson on Jaunuary 1, 2011.
Johnson presented both of these correct solutions: (1+1+1+1)!! = (4)!! = 4 x 2 =8 and 111two +1 = 4+2+1 +1 =8
It is fascinating to see how many different solutions have been created for this problem. Below are those submitted since Johnson's solution.
On September 1, 2011, David McKenna sent the following solution: ( (1+1)*arccos(-1))/arctan(1) =8
On September 9, 2011, Marc Strauss sent the solution: 8 = 1/.1 - 1 - 1
List of typos, omissions, proofing errors for:
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THE ADVENTURES OF PENROSE -Copyrght 1997, First Edition
PAGE 56- The second column, fifth line down should read: "(1/1,000,000,000) the size of the cat"
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THE MATHEMATICS CALENDAR 2012
February 15: The denominator marks were left off. The line about h1 and h2 should read h1 / h2 = 3 / 4.
February 20: The "0" numeral in the ones place for the date, February 20, did not print .
March 4: The "1" numeral appearing on the date should be 4, so that the date reads March 4 rather than March 1.
May 2: The expression should read (6-2[3m+4(2m-1)]) / 7-11m
May 15: The equation should read [(7.2 x 10^3) (1.4 x 10^6)^2] / 10 = 1.4112 x 10^?
May 27: The expression should read the 5th route of 9 to the 3rd power times the 5th root of 3 to the square root of 81, rather than the 3rd root of 3 to the square root of 81.
June 26: The Chinese number is supposed to be subtracted from the Babylonian number.
July 20: Replace diagram with the following:
October 27: The expression should read 1+2+3+...+25+26+27+26+25+...+3+2+1 = ?^2
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THE MATHEMATICS CALENDAR 2011
June: In the beginning of the 4th paragraph: "Charles Babbage (aka Lewis Carroll)" should read "Charles Dodgson (aka Lewis Carroll)".
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THE MATHEMATICS CALENDAR 2010
January 28: The
graph should show the area bounded by the parabola and the lines
x=, x=2, and y=0.
July 5:
Replace "-?" by "?".
September 26: Replace (15-3i)/? with (15+3i)/? .
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MATHEMATICAL SNIPPETS -Copyrght 2008, First
Edition, First Printing June 2008.
PAGE 42- The formula for "p" in the 5th line
from the bottom of the second column should read "p is of
the form 2^(2^n) + 1..." .
PAGE 43- The fourth line of the first column should read
"Using Gauss' formula, p =2^(2^n ) + 1..."
PAGE 161- The italics in the 2nd column first paragraph
should read another, and are stitched together by mathematics."
PAGE 162- In the 2nd column first paragraph the word "hallow
"should be "hollow".
PAGE 171- The first column 6th line should read "of
144, namely 1/48, 1/24, 1/16, 1/12, 7/48, and 1/6."
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THE MATHEMATICS CALENDAR
2009
January 17: The
problem should read: "...then its range consists of natural
numbers greater than or equal to ? ."
November 24: The problem should read: "B's Ice Cream parlor offers 3 different flavors... ?"
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THE MATHEMATICS CALENDAR 2008
April 30: Delete the value 120 from side AB.
May 14: The problem should read: Determine the maximum y-coordinate where this curve's tangent is zero.
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THE MATHEMATICS CALENDAR 2007.
January 5: Option (5) should read: 5) No rectangles are trapezoids.
March 30: The problem should read: x is a rational number. What must x equal for this triplet to represent the sides of a right triangle.
Dec 6: The following equation is missing: 4x^2 +20x + 4y^2 48y = -165
Footnote 8 for BRANES ON THE BRAINThe big tests at CERN are coming should read "8The Large Hadron Collider(LHC) is the newest addition to CERN. Its 27km circumference makes it the world's largest superconductivity installation. Superconductivity allows certain materials to conduct electricity without the loss of energy. This usually takes place at extremely low temperatures. LHD is located at at average depth of 100m underground and will operate at around 300° below room temperature, which is colder than outer space. LHD now occupies the 27 km circle which had been where the earlier LEP collider was located."
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MORE OF OF MATHEMATICS
page 63- The number in the square that appears at the intersection of the 4th column and 3rd row should be 12.
page 159- Correct a typo in the DAY NUMBERS chart, the number corresponding to Saturday's should be 0, not 7.
Revise the steps as follows for example
August 27, 1990.
1) Take the last two figures in the year, 90. This
number will be used in both step 2 and 5.
2) Divided the 2-digit number from step 1 by the number 4, and
ignore its remainder. 90÷4= 22 (and the remainder
2 you ignore).
3) Go to the month chart and find the month's number. It is 3.
4) From the desired date, take the day's number. For our example
date it is 27.
5) From the century chart find the century number for the desired
year. For 1990 its is 0.
6) Now, add together the numbers from steps 1, 2, 3, 4,5.
Divide this sum by 7, namely 90+22+3+27+0 = 142 So, 142÷7 = 20 plus remainder 2.
Use the remainder number to look up the day of the week in the DAY NUMBERS chart. For 2 it is Wednesday.
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MATH-A-DAY
3rd printing May 2004
page 217- solution for FEB 18's last sentence should read " n(n - 3)/2 = 65 --> n =13. So the polygon has 13 sides."
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THE MATHEMATICS CALENDAR 2006.
January 19: Should read: " F+4 This hexadecimal sum is ___in base ten."
April 28: Should read: " A stone-like object dropped in 8 feet of water in a cylindrical vat with a 4' diameter floats in the vat. The stone-like object raised the water level to 0.43 inches. Water weighs about 62.205 lbs per cubic foot. What is the stone-like object s weight to the nearest pound?"
May 21: 3(square root of 2) should read 7(square root of 2): The statement should read: "(9/49) of this cone's volume is ___pi cubic units."
June - In topic, replace the phrase "3.415926... its symbol" with "3.1415926... its symbol" . In June's footnote at back of calendar The golden mean should read "1.6180339887...".
September 10: Should read: " 50! ends in 2+__zeros."
December 23-: The angles in the diagams should be changed as follows: 70 degrees is a degrees. 110 degrees should be 180 degrees minus a degrees.
December 30: The first sentence should read: "Two friends flew with 105 lbs. of baggage together.".
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THE MATHEMATICS CALENDAR 2005.
January 4-
The word "thousands" in the last sentence should be
"hundreds".
January 16- The last sentence should read "Its
volume is ___(sq. root of 2)/3."
April 2-
The number 6 in the equation should be a negative 6.
April's story-The 2nd to the last sentence should read
"In fact, a square is a convex quadrilateral."
May 10-The questions should read: "Find the radius of the circle."
June 20- The point of tangency on the side of length 4 is also a bisection point. Two marks on each side of this tangent point were left off.
July 16- The 40° should be deleted
July 30- After the last 15 in the problem, the square root of 2 should follow it, so it reads: 15(square root of2)
August 9-- The final sentence should read: "Find the largest value for its width."
Page 26 under FOOTNOTES & ADDITIONAL INFORMATION: In footnote 8 delete ".com" after the word "Hotbits".
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