Solution:
A = {7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, ...}
B = {5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, ...}
C = {35, 70, 105, ...}
∴ A ∩ B ={35,70,105,....}
⇒(A∩B)–C = Set of all those elements of (A ∩ B) which do not belong to C = ϕ
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