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Multiple Choice Questions
1. When 'n' is divided by 5 the remainder is 2. What is the remainder when n2 is divided by 5?
(A): 2
(B): 3
(C): 1
(D): 4
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By: anil on 05 May 2019 02.00 am
n = 5k+2 (where k is quotient )
so $$n^2 = 25k^2 + 4 + 20k$$
Now when $$n^2$$ will divided by 5 , remainder will be 4.
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SSC CGL 2011 Tier 1 - Shift 2
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so $$n^2 = 25k^2 + 4 + 20k$$
Now when $$n^2$$ will divided by 5 , remainder will be 4.