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 Let the 9 different letters A,B,C,,I{1,2,3,9} then the probability that product (A1)(B1)(I9) is even number will be 

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a
12
b
14
c
1
d
0

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detailed solution

Correct option is C

Given set of numbers is {1,2, ...,9} in which 4 are even and 5 are odd, so in the given product it is not possibleto arrange to substract only even number from odd number, there must be at least one factor involving subtraction of an oddnumber from another odd number. So, at least one of the factor is even. Hence product is always even..'. Required Probability = 1


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The odd against an event are 5 to 2 and the odds in favour of another disjoint event are 3 to 5. Then the probability that atleast one of the events will happen is


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