If {(a, 8),(6,b)} represents an identity function, then the value of a and b are respectively ?

8, 6

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8, 8

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6, 8

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6, 6

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Solution

The correct option is A 8, 6
The function f : A $\to$ A is identity function if f( x ) = x, i.e every element of A is image of itself.
Given, f(a) = 8 and f(6) = b
$∴$ a = 8 and b = 6

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