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