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Question

Which of the following numbers will completely divide 2^61+2^62+2^63+2^64?

a) 100
b) 10
c) 27
d) 17

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Solution

given that :



(261 + 262 + 263 + 264)

= 261 x (1 + 2 + 22 + 23) = 261 x 15

= 260 x (2 x 15)

= (260 x 30), which is divisible by 10.


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