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If (x,y) belongs to a set of {1,2,3,....,100} then the probabiltiy that xy is divisible by 3 is ?

If (x,y) belongs to a set of {1,2,3,....,100} then the probabiltiy that xy is divisible by 3 is ?

Grade:12

1 Answers

SAGAR SINGH - IIT DELHI
879 Points
12 years ago

Dear swetha,

(x,y) belongs to a set of {1,2,3,....,100}

for a number divisible by 3 the sum of the digits has to be divisible by 3. Use this trick and check whether you are getting the required probability as 3/91 or not...

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Sagar Singh

B.Tech, IIT Delhi



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