A binary operation * is defined on the set of real numbers R, by a* b = -1. Find the identity element under the operation *.

A binary operation * is defined on the set of real numbers R, by a* b = -1. Find the identity element under the operation *.

A -1
B 0
C 1
D 2

waec 2011 furthermathematics

The correct answer is A. -1

\(a * a^{-1} = e = -1\)

\(\therefore a^{-1} = -1\)

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