In a array x, count the number of times the number n appears in x.
for example: x = [1 2 3 4 3 2 1 2] and n = 2 the answer should be 3, because 2 appears 3 times in x
Determine the number of odd integers in a vector
Find the logic
Skip by a multiple
Determine if input is divisible by three.
multiple of nine?
Add the odd numbers
Second smallest number
Remove multiples of N
Add the positive numbers
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