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
Implement a ROT13 cipher
give nth decimal place of pi
Project Euler: Problem 10, Sum of Primes
Getting the absolute index from a matrix
Dick Van Dyck?
swap sign sum & multiply castles
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