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If S1 is the sum of an AP of 'n' odd num...

If `S_1` is the sum of an AP of 'n' odd number of terms and `S_2` be the sum of the terms of series in odd places of the same AP then `S_1/S_2` =

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S_1= Sum of odd number of terms
`=n/2{2a+(n−1)d}……(1)`
Since n is odd, the number of odd places =(n+1)/2
S_2= Sum of the terms of a series in odd places
...
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