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Prove the following by using the principle of mathematical induction for all n∈N1+1(1+2)+1(1+2+3)+⋯+1(1+2+3+⋯+n)=2nn+1

Answer» Prove the following by using the principle of mathematical induction for all nN

1+1(1+2)+1(1+2+3)++1(1+2+3++n)=2nn+1


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