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:

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