If ${\log _{10}}3 = 0.477$, the number of digits in ${3^{40}}$ is
If ${\log _{10}}3 = 0.477$, the number of digits in ${3^{40}}$ is
- [IIT 1992]
- A
$18$
- B
$19$
- C
$20$
- D
$21$
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