If $x$ is added to each of numbers $3, 9, 21$ so that the resulting numbers may be in $G.P.$, then the value of $x$ will be
If $x$ is added to each of numbers $3, 9, 21$ so that the resulting numbers may be in $G.P.$, then the value of $x$ will be
- A
$3$
- B
$\frac{1}{2}$
- C
$2$
- D
$\frac{1}{3}$
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