The probability of drawing a white ball from a bag containing $3$ black balls and $4$ white balls, is
The probability of drawing a white ball from a bag containing $3$ black balls and $4$ white balls, is
- A
$\frac{4}{7}$
- B
$\frac{3}{7}$
- C
$\frac{1}{7}$
- D
None of these
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- [IIT 1974]
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