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An electric instrument consists of two units. Each unit must function independently for the instrument to operate. The probability that the first unit functions is 0 . 9 and that of the second unit is 0 . 8 . The instrument is switched on and it fails to operate. If the probability that only the first unit failed and second unit is functioning is p , then 98 p is equal to

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Given that An electric instrument consists of two units. Each unit must function independently for the instrument to operate. The probability that the first unit functions is 0 . 9 and that of the second unit is 0 . 8 . The instrument is switched on and it fails to operate. If the probability that only the first unit failed and second unit is functioning is p . Let E 1 = Event of first unit is working E 2 = Event of second unit is working P E 1 = 0 . 9    P E 2 = 0 . 8 We know that P E   =   1 &

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