AY. Dollar Cost Averaging
A common investment strategy takes advantage of the subtleties of averaging.
Archive for numbers
AX. Averages are not what they seem!
Is a man of perfectly average height, and perfectly average weight, too heavy for his size? Averages are not what they seem to be.
AW. Will we run out of Social Security Numbers?
When will the crisis come? When will we run out of Social Security Numbers, and other musings.
AV. Dennis Shasha Answers
Dennis Shasha, author of The Puzzler’s Elusion explains how his finger multiplication works!
AU. Dennis Shasha asks about Polish Multiplication
Dennis Shasha, puzzle columnist for Scientific American, asks about a curious way to multiply numbers on your fingers.
AO. Choosing Balls from A Bag
A fifty-fifty chance of drawing four blue balls from a bag: how many balls were blue?
AG. The Eagle
How to do infinitely many things in a few minutes!
AF. Counting All Rationals
Are there more fractions than counting numbers?
AD. Bigger and Smaller Infinities
Are there only half as many even numbers as counting numbers?
AB. The Rational Ruler
Finer and finer, a ruler with infinitely many marks…
We answer last week’s puzzle, discuss rational and irrational numbers, and pose a little question about coins.
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