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 :

with
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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 :