Solve:
$16 + 11 + 6 + . . . . .23$ terms ____

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Solution

$16 + 11 + 6 + . . .23$ terms
It is an AP with $a = 16$ and $d = - 5$
$∴$ Sum $= \frac{23}{2} [32 + (22 \times - 5)]$
$= \frac{23}{2} [32 - 110] = - 897$

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23 + (- 17) + (- 11) + 16

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