Teaching DSSSB PGT Mock Test 2025 Mathematics Relations and Functions Binary Operations

Let R be the set of real numbers and * be the binary operation defined on R as a * b = a + b - ab ∀ a, b ∈ R. Then, the identity element with respect to the binary operation * is:

1
\(\frac{1}{1-a}\)
2
1 - a
3
1
4
0
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