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Total number of ways of selecting two numbers from the set {1,2,3,4.....,90} so that their sum is divisible by3, isA. 885 1335 1770 3670

Satviki Pathak , 10 Years ago
Grade 11
anser 1 Answers
haroon

Last Activity: 10 Years ago

1335.   Select two numbers both div by 3  30c2 + one no from set 1,4,7... and one from 2,5,8... -- 30c1 *30c1  so total is 1335

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