Classical and Conditional Probability
Medium
Conditional Probability Balls
Two balls are selected at random one by one without replacement from a bag containing 4 white and 6 black balls. If the probability that the first selected ball is black, given that the second selected ball is also black, is 
, where gcd(m, n) = 1, then m + n is equal to :
, where gcd(m, n) = 1, then m + n is equal to :SELECT ONE OPTION