For a given finite $A.P.$,$a=1, l=10$ and $n=10$. Then,$S_{10} = ........$

  • A
    $100$
  • B
    $55$
  • C
    $50$
  • D
    $65$

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The sum of the first $n$ terms of the $A.P.$ $2, 7, 12, 17, \ldots$ is $990$. Find the value of $n$.

Find the sum:
$1+(-2)+(-5)+(-8)+\ldots+(-236)$

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