Prove that 1+2+3+....+k = [k(k+1)]/2 using mathematical induction ...

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Prove that 1+2+3+....+k = [k(k+1)]/2 using mathematical induction

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    Let P(k): 1 + 2 + 3 + … k = k(k + 1)/2 P(1): 1 = 1(1 + 1)/2 ...
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