For example, chance is 100% for minimum 0 heads when a coin is tossed 7 times.
Chance is 50% for minimum 2 heads when a coin is tossed 3 times.
Chance is 0% for minimum 12 heads when a coin is tossed 11 times.
this problem could use some nontrivial testcases
Select every other element of a vector
Reverse Run-Length Encoder
Project Euler: Problem 2, Sum of even Fibonacci
Getting logical indexes
Sum the Digits of a Number
Create One Large Eye of size N x N Quickly?
given 3 sides, find area of this triangle
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