Q. A bag contains 6 white and 4 black balls. Two balls are drawn at random. The probability that they are of the same colours, is
A) $\frac{1}{15}$
B) $\frac{2}{5}$
C) $\frac{4}{15}$
D) $\frac{7}{15}$
Explanation
(d)
The required probability$= \frac{\ ^{6}C_{2} +^{4}C_{2}}{\ ^{10}C_{2}} = \frac{7}{15}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.