" on a "a*b=(ab)/(4)" then find the identity elemence "

Let S be the set of positive rational numbers and is defined by a ** b=(ab)/2 . Then find the identity element and the inverse of 2.

Let * be a binary operation defined on the set of non-zero rational number, by a**b = (ab)/(4) . Find the identity element.

Consider the set Q with binary operation '**' as: a**b=(ab)/(4) . Then, the identity element is:

If * defined on the set R of real numbers by a*b=(3ab)/(7), find the identity element in R for the binary operation *

If the binary operation . on the set Z is defined by a.b =a+b-5, then find the identity element with respect to ..

On Q - {0} define * by a ** b = (ab)/5 . Find the identity element.

*be a binary operation on Q,defined as a**b=(3ab)/5 Find the identity element of *if any.

Let * be a operation defined on the set of non zero rational numbers by a * b = (ab)/4 Find the identity element.

Let '**' be a binary operation defined on NxxN by : (a** b)=(ab)/2 . Find the identity element for '**' , if it exists.

Let * be a binary operation o Q defined by a^(*)b=(ab)/(4) for all a,b in Q,find identity element in Q