Let $S_n$ denote the sum of first $n$ terms an arithmetic progression. If $S_{20}=790$ and $S_{10}=145$, then $S_{15}-$ $S_5$ is:
Let $S_n$ denote the sum of first $n$ terms an arithmetic progression. If $S_{20}=790$ and $S_{10}=145$, then $S_{15}-$ $S_5$ is:
- [JEE MAIN 2024]
- A
$395$
- B
$390$
- C
$405$
- D
$410$
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- [JEE MAIN 2024]
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