Using {1, 2, 3, 4,5} four digited numbers are formed without repetation at random. The probability that the number so formed is not divisible by 5 is

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answer is D.

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Detailed Solution

1, 2, 3, 4, 5 n(S)=5P4 n(A)=4.P3 4P(A)=4.P3 4P4 5=45

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