If 18, a, b, -3 are in A.P. then a + b = - Vidyadip

MCQ

If $18, a, b, -3$ are in $A.P$. then $a + b =$

A
$7$
✓
$15$
C
$11$
D
$19$

✓

Answer

Correct option: B.

$15$

$18, a, b, -3$ are in $A.P.$
then $a - 18 = -3 - b$
$\Rightarrow a + b = -3 + 18$
$\Rightarrow a + b = 15$

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