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CBSE XII
>>
Math
>>
Relations and Functions
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Q)
On Q the set of all rational numbers, a binary operation
∗
is defined by
a
∗
b
=
a
b
5
for all
a
,
b
∈
Q
. Find the identity element
∗
in Q. Also prove that every non-zero element of Q is invertible.
(
A
)
26
a
(
B
)
−
26
a
(
C
)
25
a
(
D
)
−
25
a
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