Answer :

i. The possible values of n : 1, 2, 3, 4

∴ The possible values of x : 5, 25, 125, 625

∴ A = {5, 25, 125, 625}

∴ n(A) = 4

ii. B = {b, c, d, f, g, h, j, k, l, m, n, p, q, r, s, t, v, w, x, y, z}

∴n(B) = 21

iii. The only even prime number is : 2

∴ X = {2}

∴ n(X) = 1

iv. There are no possible values of x.

∴ P = ϕ

∴ n(P) = 0

v. The possible values of x : -3, -2, -1, 0, 1, 2, 3, 4, 5

∴ Q = {-3, -2, -1, 0, 1, 2, 3, 4, 5}

∴ n(Q) = 9

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