Let * be the binary operation on the rational number given by a*b=a+b+2ab. which of the following are true?
i. * is commutative
ii. there is a rational number that is an identity with * operation
iii. every rational numebr has an inverse with * operation
I know that i is true and iii is false but why is ii false?
Ans: (i) is only true
hi, but according to this post