Which of the following numbers will completely divide
261 + 262 + 263 + 264?
​(a)100
(b) 10
​(c)27
​(d)17

Dear Student,

(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.

Regards
 

  • 13
ANS is 10

it is so hard sum
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