JEE MATHEMATICS MCQ: SEQUENCE OF SERIES

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Application +4 | -1

S_{\mathrm{r}}

denotes the sum of the first

r

terms of an A.P., then

\frac{\mathrm{S}_{3 \mathrm{r}}-\mathrm{S}_{\mathrm{r}-1}}{\mathrm{~S}_{2 \mathrm{r}}-\mathrm{S}_{2 \mathrm{r}-1}}

is equal to

View answer and explanation

Correct option: B

2 r+1

Option B (

2r+1

) is correct because, after simplification and substitution, the expression equals

2r+1

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