Write the relation R = {(x, x3) : x is a prime number less than 10} in roster form.
Given: R = {(x, x3) : x is a prime number less than 10}
As we know the prime number less than 10 are 2, 3, 5 and 7.
Hence the relation in roaster form, R = {(2,8), (3,9), (5,125), (7,343)}