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Q.

One hundred tickets are numbered as 00,01,02,......,09,10,11,......,99 and one ticket is drawn at random from them. If A is the event of getting 9 as the sum of the numbers on the ticket and B is the event of getting 0 as the product of the numbers on the ticket then P(AB)=

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a

1100

b

10100

c

19100

d

2100

answer is B.

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Detailed Solution

A=Sum 9, B=Product 0

AB= Sum of the two numbers is 9 and product 0

     ={09,90}

     n(S)=100

     n(AB)=2               

    P(AB)=2100

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