If $2 x, x + 8, 3 x + 1$ are in A.P., then the value of $x$ will be

3

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7

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5

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- 2

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Solution

The correct option is D $5$
$2 x, x + 8, 3 x + 1$ are in A.P.

Thus,
$(x + 8) - 2 x = (3 x + 1) - (x + 8)$
$8 - x = 2 x - 7$
$3 x = 15$
$x = 5$

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