A) Both balls are white
B) One ball is white and one is black
C) Both balls are black
D) All of the above are equals
Correct Answer: B
Solution :
Probability that both balls are white \[=\frac{{}^{7}{{C}_{2}}}{{}^{15}{{C}_{2}}}=\frac{1}{5}\] Probability that both balls are black \[=\frac{{}^{8}{{C}_{2}}}{{}^{15}{{C}_{2}}}=\frac{4}{15}\] Probability that one ball is white and one is black \[=\frac{{}^{7}{{C}_{1}}\times {}^{8}{{C}_{1}}}{{}^{15}{{C}_{2}}}=\frac{8}{15}\].
You need to login to perform this action.
You will be redirected in
3 sec
