Number of binary operation on the set { a, b } is

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Solution

The correct option is B
16

Number of binary operations from

A to B = $n (B)^{n (A) \times n (B)} = 2^{4} = 16$

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Number of binary operations on the set {a, b} are

(A) 10 (B) 16 (C) 20 (D) 8

Number of binary operations on the set {a,b} are
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(c)20
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Let * be a binary operation defined on set of rational numbers, by a * b = $\frac{a b}{10}$ . Find the identity element.

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