Question

Let S₁ = (1, 2, 3,... 20), S₂ = (a, b, c, d, e) and S, = la, c, e, fl, then the number of elements of (S₁ x S₂) (S₁ x S) is :​

Answer 1

Answer:

(S1xS2) = (S1=20) (S2x5)= 100

(S1xS2) =( S1 = 20) (S=4) = 80

so the answer is 100x80 = 800