On Q define * by `a ** b = (ab)/3`. Show that * is associative.

*be a binary operation on Q,defined as a**b=(3ab)/5 .Show that * is associative.

On Q, define * by a ** b = (2ab)/3 . Show that * is both cummutative and associative.

On Q, define * by a ** b = (ab)/4 . Show that * is both commutative and associative.

Let '*' be a binary operation on Q defined by a * b = (3ab)/5. Show that * is commutative as well as associative. Also, find its identity element, if it exists.

On Q , the set of all rational numbers a binary operation * is defined by a*b= (a+b)/2 . Show that * is not associative on Qdot

Q, the set of all rational number, * is defined by a * b=(a-b)/2 , show that * is no associative.

Let '*' be a binary operation on Q defined by : a* b = (3ab)/5 . Show that * is commutative as well as associative. Also find its identity element, if its exists.

On Q, the set of all rational numbers a binary operation * is defined by a*b=(a+b)/(2) Show that * is not associative on Q.

Q, the set of all rational number, * is defined by a*b= (a-b)/2 , show that * is not associative.

Let '**' be a binary operation on Q defined by : a**b=(2ab)/(3) . Show that '**' is commutative as well as associative.