Problem $3$:

$6**2=12pts$

Define a function flatten$-$subtract$-$triple that takes a nested list of numbers, flattens it into a single list, subtracts $1$ from each number, and then triples each resulting number.

$\backslash$table$[[$Sample Input,Sample Output$],[\text{'}(1(23)(4(5))),\text{'}(0366912)],[,([18,2124,27])$

$,()$