15. A bag contains nine balls which are numbered 1 to 9. Andi takes ball from the bag and returns it again. Boby also takes a ball from th bag and returns it again. If the numbers of balls drawn by Andi ar Bobby are x and y respectively, then the probability of fulfilling th inequality is y – 2x + 8 > 0 is... 46 А. 81 48 81 50 81 52 D. 81 54 Е. 81 B. C.

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