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Let the probability of success of an event = x probability of failure = y A/Q, As we know that the sum of the probabilities of success and failure of an event is always equal to 1. i.e, x + y = 1 ----------------(i) Now, x - y = 3/17 --------------(ii) Add both the equations. 2x = 1 + 3/17 or, 2x = (17 + 3)/17 =20/17 or, x = 10/17 and y = 10/17 - 3/17 = 7/17 Therefore probability of success = x = 10/17 and probability of failure = y = 7/17