NCERT Class XII Mathematics Chapter - - Solutions
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Question : 73
Total: 101
A bag consists of 10 balls each marked with one of the digits 0 to 9. If four balls are drawn successively with replacement from the bag, what is the probability that none is marked with the digit 0 ?
Solution:
The probability of ball with digit 0 is drawn =
let p be the probability of success =
X has the binomial distribution withn = 4 , p =
, q =
∴ P ( X = r ) = n C r ( q ) n − r p r
∴ P (none is marked with 0) = P(X = 0)
= 4 C 0 q 4 p 0 = 1 × (
) 4 × 1 = (
) 4
let p be the probability of success =
X has the binomial distribution with
∴ P (none is marked with 0) = P(X = 0)
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