If $9, a, b, - 6$ are in Arithmetic progression, then $a + b =$

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Solution

The correct option is D $3$
$9, a, b, - 6$ are in A.P.
$a - 9 = b - a = - 6 - b$
by $a - 9 = - 6 - b$
$a + b = 3$

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