A bag contains $3$ red, $7$ white and $4$ black balls. If three balls are drawn from the bag, then the probability that all of them are of the same colour is
A bag contains $3$ red, $7$ white and $4$ black balls. If three balls are drawn from the bag, then the probability that all of them are of the same colour is
- A
$\frac{6}{{71}}$
- B
$\frac{7}{{81}}$
- C
$\frac{{10}}{{91}}$
- D
None of these
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