question_answer 1)

A bag contains 10 balls each marked with one of the digits 0 to 9. It 4 balls are drawn successitvely with replacement from the bag, wihat is the probability that none is marked with the digit 0 ? 

Answer:

Probability of getting a ball out of 10 balls marked with the digit 0 =             Let x be the number of balls marked with the digit 0, then x has the binomial distribution with n = 4, p       P (none of the ball marked with 0)       = P(x = 0) = 4C0