Knowing that 123-45-67+89=100, write a function that gives this result for any order of the digits in the input. Otherwise, the function should give 'NaN'.
Check if sorted
Read a Soroban Abacus
First non-zero element in each column
Determine Whether an array is empty
Say type of roots in quadratic equation
Alternate list of elements
Check if is a square
Double the next!
Sum of a geometric series
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