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Let ai=i+1i for i=1,2,...,20. Put p=120(a1+a2+⋯+a20) and q=120(1a1+1a2+⋯+1a20). Then

Answer»

Let ai=i+1i for i=1,2,...,20. Put
p=120(a1+a2++a20) and q=120(1a1+1a2++1a20).
Then



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