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Q.

The sum of two positive numbers is 10. The probability that their product is greater than 20 is

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a

19

b

49

c

59

d

1920

answer is C.

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Detailed Solution

A=Sum=10={(1, 9), (9, 1), (2, 8), (8, 2), (3, 7), (7, 3), (4, 6), (6, 4), (5, 5)} n(A)=9 n(A∩B)=5 P(BA)=59  The probability that their product is greater than 20 is 59
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