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Algebra Level 2

4 41 + 4 42 + 4 43 4^{41}+4^{42}+4^{43} is divisible by..?

7 13 15 none of these 17

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1 solution

Jyotsna Sharma
Jan 8, 2015

4^41+4^42+4^43 can be written as 4^41(1+4+4^2)=4^41(21). Therefore 7 is one of its factor [21=7×3]. So answer becomes 7

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