Question : 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
(A) 1/247
(B) 2/247
(C) 4/741
(D) 5/741
Answer : option (C)
Solution :
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
with
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