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in this the no. that is divisible by 7 are : 28 and 56

Set Y = Multiples of 7 between 17, 61 = 21,28,35,42,49,56

X U Y= Z

Cross repeating numbers in Z ⇒ 28,56 = Set A

Set A = Multiples of 4 between 17 and 61 divisible by 7 = 28,56

Ans: