Quantitative Aptitude Ques 422

Question: A bag contain 13 white and 7 black balls. Two balls are drawn at randomly. What is the probability that they are of the same colour? [SBI (PO) 2012]

Options:

A) $ \frac{41}{190} $

B) $ \frac{21}{190} $

C) $ \frac{59}{190} $

D) $ \frac{99}{190} $

E) $ \frac{77}{190} $

Show Answer

Answer:

Correct Answer: D

Solution:

  • $ \frac{{}^{13}C _2+{}^{7}C _2}{{}^{20}C _2}=\frac{99}{190} $
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