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A bag contains 7 green and 5 black balls. Three balls are drawn one after the other. The probability of all three balls being green, if the balls drawn are not replaced will be:
Options:
A .  $$\frac{{343}}{{1728}}$$
B .  $$\frac{{21}}{{36}}$$
C .  $$\frac{{12}}{{35}}$$
D .  $$\frac{{7}}{{44}}$$
Answer: Option D

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