I need some help for the answer
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Step-by-step explanation:

Given

Input : x

Rule: Subtract 10 from input

Output: y

Required

Determine the output

The rule implies that: when 10 is subtracted from x, it gives y.

This is represented as:

2 numbers are relatively prime, if they have no common factor except 1.

The positive integers less than 12 are {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11}

12 and  {2, 4, 6, 8, 10} have 2 as a common factor

12 and {3, 9} have 3 as a common factor.

{1, 5, 7, 7} are left. These numbers have no common factor with 12 except 1.

{1, 5, 7, 11}