1.

In a bag there are 20 cards 10 names A and another 10 names B. Cards are drawn randomly one by one with replacement then find probability that second A comes before third B.(1) 13/16(2) 11/16(3) 7/16(4) 9/16

Answer»

Answer is (2) 11/16

AA + ABA + BAA + ABBA + BBAA + BABA

= 1/4 + 1/8 + 1/8 + 1/8 + 1/16 + 1/16 + 1/16 = 11/16



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