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Sum of n Terms

21. rth term ...

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21. rth term of a series is the sum of rth terms of an A.P. and rth term of a G.P.; whose first terms are equal to one each and the common difference of the A.P. and common ratio of the G.P. are equal to n each, n N. Number of such terms in this series which are perfect squares of a natural number for all n, is

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