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14 MAR 2018

Can You Solve This Pi Day Riddle? [UPDATE: Answer Revealed]

In celebration of the mathematical constant pi, earlier today we published this riddle. The answer is below.
 

 

The Answer: "Pi days"

How to solve:

1) Use the formula for continuously compounded interest: A = P * ert
In this problem, $1 = -$1 *eit

2) Remember Euler’s Identity: e + 1 = 0, or e = -1

Looks like t = π!

3) Finally, check your work:

$1 = -$1 * e

$1 = -$1* -1

$1 = $1