Q. 43 W4.7( 3 Votes )

(5k + 1)2 leaves remainder ……….. on dividing by 5.
A. 2

B. 0

C. –1 or 1

D. 1

Answer :

(5k + 1)2 = 25k2 + 10k + 1 = 5(5k2 + 2k) + 1


(5k + 1)2 leaves remainder 1 when divided by 5

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