Q.

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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a

15

b

35

c

25

d

45

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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