Question

A bag contains 15 balls of which some are white and some are black the probability of drawing a black ball is 2 by 3 so find the number of white balls in the back

Answer 1

probability of black ball is 2/3 .

so number of black ball is given as = total ball × prob of black ball

= 15×2/3 = 5×2 = 10

so black balls are 10

so white balls are = 15 - 10 = 5