Mathod of induction 1^2+2^2+3^2...+n^2=n(n+1)(2n+1)/6
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Step-by-step explanation:
by using first step..
put n = 1
(1)². =. (1+1)(2×1+1)/6
1. =. ( 2×3)/6===1
hence n=1 is true
let be put n=k
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