Question

Let R be a relation defined by

R = {(x, x3) | x is a prime number < 10 } then which of the following is true.

(A) R = {(1, 1), (2, 8), (3, 27), (4, 64), (5, 125), (6, 216)

 (7, 343), (8, 512), (9, 729)}

(B*) R = {(2, 8), (3, 27), (5, 125), (7, 343)

(C) R = {(2, 8), (4, 64), (6, 216), (8, 512)}

(D) none of these

Answer 1

Given x is a prime < 10

∴ x = {2, 3, 5, 7}

vc R = {(x, x3) | x = 2, 3, 5, 7}

= {(2, 8), (3, 27), (5, 125), (7, 343)