The number of non-bijective mappings that can be defined from $A = {1, 2, 7}$ to itself is

21

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27

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6

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9

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Solution

The correct option is C $21$
Total number of functions from $A$ to itself is $3^{3} = 27$
No of bijections is $3! = 6$
$∴$ No of non bijective maps is $27 - 6 = 21$

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