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CBSE Class 12-science Answered

For the binary operation * defined by a * b = a + b + 1. Find the identity element for operation *.

Asked by Topperlearning User | 26 Apr, 2016, 11:58: AM
Expert Answer

Let e be the identity element for operation * and we know that

a * e = a = e * a.
 
or a + e + 1 = a   and  e + a +1 = a
or e = – 1 and e = – 1.
Thus, – 1 is the identity element for operation *.
Answered by | 26 Apr, 2016, 01:58: PM
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