Q. 9 C5.0( 5 Votes )

Let be a binary operation on the set Q of rational numbers as follows:

a b = a + ab

Find which of the binary operations are commutative and which are associative.

Answer :

It is given that be a binary operation on the set Q of rational numbers is defined as

a b = a + ab


We can see that 1 * 2 = 1 + 1 × 2 = 1 + 2 = 3


and 2 * 1 = 2 + 2 × 1 = 2+2 = 4


1 *2 ≠ 2 * 1: where 1,2 ϵ Q.


the operation * is not commutative.


Also, We can see that (1 * 2) * 3 ≠ 1 *(2 * 3), where 1,2,3 ϵ Q


Therefore, the operation * is not associative.


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