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Q. If $S _1, S _2$ and $S _3$ denote the sums upto 10 terms of three sequences in A.P., whose first terms are unity and common difference are in H.P., then the value of $\frac{2 S_1 S_3-S_1 S_2-S_2 S_3}{S_1-2 S_2+S_3}$ equals to-

Sequences and Series

Solution:

Correct answer is (c) 10