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1. Find the flaw with the following "prof" that a^n = 1 for all non negative integers n, whenever a is a nonzero real number.
Basis Step: a^0 = 1 is true by the definition of a^0.
Inductive Step: Assume that a^j = 1 for all non negative integers j with j <= k. Then note that
a^(k+1) = (a^k*a^k)/(a^k-1) = 1*1/1 = 1
2. Find the flaw with the following "proof" that every postage of three cents or more can be formed using just three-cent and four-cent stamps.
Basis Step: We can form postage of three cents with a single three-cent stamp and we can form postage of four cents using a single four-cent stamp.
Inductive Step: Assume that we can form postage of j cents for all non negative integers j with j <= k using just three-cent and four-cent stamps. We can then form postage of k + 1 cents by replacing one three-cent stamp with a four-cent stamp or by replacing two four-cent stamps by three-cent stamps.
Calculate the average cost function.
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Two friends are both on a local running team. They run at the exact same rate of 7 miles per hour. They are running the exact same race course, but one friend starts running an hour after the other friend.
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