Question
Which one of the following numbers will completely divide (`4^61` + `4^62` + `4^63` +`4^64`) ?
Answer: Option B
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(`4^61` + `4^62` + `4^63` +`4^64`) = `4^61` `xx` ( 1+ 4 +`4^2` +`4^3` ) = `4^61` `xx` 85
= `4^60` `xx` (4 `xx` 85 ) = (`4^60` `xx` 340), which is divisible by 10.
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