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
detailed solution
Correct option is C
Given,7a−9b=0 or b=79aHence, number of pairs (a, b) can be (9, 7); (18, 14); (27, 21); (36, 28). Hence, the required probability is 439C2=4741Talk to our academic expert!
Similar Questions
A bag contains 10 different balls. Five balls are drawn simultaneously and then replaced and then seven balls are drawn. If the probability that exactly three balls are common to the two draws is p, then the value of 8p is ________.
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