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Question

The value of 642 is equal to


A

4096

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B

4024

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C

4048

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D

4072

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Solution

The correct option is A

4096


642 can be written as

64×64

=(60+4)×(60+4)

=60×60+60×4+4×60+4×4

=3600+240+240+16

=4096


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