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Q.

Seven digits from the digits 1,2,3,4,5,6,7,8,9 are written in a random order. The probability that this seven digit number is divisible by 9 is

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a

15

b

34

c

19

d

13

answer is D.

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Detailed Solution

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 Total number of seven digit number is =9C7=36  For divisibility with 9, leave one of (1,8)(2,7)(3,6)(4,5) ∴ Required probability =436=19
 

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