Questions
Two numbers a? b are chosen from the set of integers 1, 2, 3, .…. 39.Then probability that the equation 7a - 9b = 0 is satisfied is
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a
1/247
b
2/247
c
4/741
d
5/741
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Correct option is C
Given,7a−9b=0 or b=79aHence, number of pairs (a, b) can be (9,7); (18, A); (27 ,21); (36,28). Hence, the required probability is 4/39C2=4/741Similar Questions
The odd against an event are 5 to 2 and the odds in favour of another disjoint event are 3 to 5. Then the probability that atleast one of the events will happen is
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