Question

A = {x | x ∈ N, x is a factor of 12}

B = {x | x ∈ N, x is a multiple of 2, x < 12}
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Answer 1

A = {12,24,36,...}

B = { 2,4,6,8,10 }

Answer 2

Answer:

so factor of 12 is any number that is divisible by 12:

A = { 1, 2, 3, 4, 6, 12 }

x is  multiple of 2, x is lesser than 12:

B = { 2, 4, 6, 8, 10 }