If $2x,\;x + 8,\;3x + 1$ are in $A.P.$, then the value of $x$ will be
If $2x,\;x + 8,\;3x + 1$ are in $A.P.$, then the value of $x$ will be
- A
$3$
- B
$7$
- C
$5$
- D
$-2$
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