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Expansion of (a ± b ± c)²

If 3 +3 + d...

Question

If $3 + (3 + d) + (3 + 2 d) = 15$ , then the value of $d$ is

2

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Solution

The correct option is A $2$
The given series is $3 + (3 + d) + (3 + 2 d)$
THeir sum is $15$
$⟹ 3 + 3 + d + 3 + 2 d = 15 9 + 3 d = 15 3 + d = 5 d = 2$

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