Question

a bag contains 4 white and 6black balls one ball is drawn and laid aside without noticing iys colour. another ball is then drawn what is the probability that the second ball is black

Answer 1

Answer

total ball left = 9
total no. of outcomes = 6
p(E) = 6/9
= 2/3

Answer 2

Total no : of balls = 10
As first ball is drawn , the total no : of balls remaining = 10 - 1 = 9.
No:of black balls = 6
probability of black ball = 6 / 9 = 2/3