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A particle travels a distance of 20 m in...

A particle travels a distance of 20 m in the `7^(th)` seconds and 24 m in `9^(th)` second. How much distance shall it travel in the `15^(th)` second?

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The correct Answer is:
`36 m`
`S_(n)=u+a/2 (2n-1)` by putting the value of `n=7` and 9, find the value of u & `a, u=7 m//s` & `a=2 m//s^(2)`.
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