Arithmetic Ability
 Probability

80 / 132

Q.

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:

View Answer

Correct choice: C

Explanation:

Here, n(E) = 7C1×5C1×5C1 And, n(S) = 12C1*11C1*10C1 P(S) = 7*6*5/12*11*10 = 7/44
80 / 132