The sum of 9 terms of an AP will be , if the middle term of the AP is 10.

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Solution

The correct option is A 90
Given that the middle term of the AP is 10.
We know that sum to $n$ terms of an AP, where $n$ is odd is given by
$S_{n} = n \times middle term .$
$\Rightarrow S_{9} = 9 \times 10 = 90$

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