If U = {1, 2, 3, 4, 5} and A = {2, 5, 1}. The number of elements in a set A' is ___.

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A

3

B = {3, 4, 5}

(A \times B)

If set A = {1, 2, 3} and set B = {2, 3, 5, 7}. Then the number of elements in A $\times$ B is ___

A = {5, 6, 7}, B = {1, 2, 3, 4}

(A - B) \times B

R = {P : B \subseteq P \subseteq A} .

A = {1, 2, 3, 4, 5}

B = {1, 2},

R

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