Question

A box has ten chits numbered $0,1,2,3,.....,9$. First, one chit is drawn at random and kept aside. From the remaining, a second chit is drawn at random. What is the probability that the second chit is drawn at random. What is probability that the second chit drawn is "$9$"?

• A. $\frac{1}{10}$
• B. $\frac{1}{9}$
• C. $\frac{1}{90}$
• D. None of the above

Answer 1

Answer: (C)

$\frac{1}{90}$

Event = $n\left(E\right)=1$,

Total cases = $n\left(S\right)=10\times 9=90$

$⟹P\left(E\right)=\frac{1}{90}$