# In a box, there are 20 cards,

Question:

In a box, there are 20 cards, out of which 10 are lebelled as A and the remaining 10 are labelled as B. Cards are drawn at random, one after the other and with replacement, till a second A-card is obtained. The probability that the second A-card appears before the third B-card is:

1. $\frac{11}{16}$

2. $\frac{13}{16}$

3. $\frac{9}{16}$

4. $\frac{15}{16}$

Correct Option: 1

Solution: