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July 5, 2015

Homework Help: Maths

Posted by John on Tuesday, February 19, 2013 at 2:44am.

Siuan's grandmother recently signed up for a twitter account. She only follows five people - her five grandchildren. Each day, each of her grandchildren make two tweets and at the end of the day Siuan's grandmother gets an e-mail that lists all ten tweets in chronological order. If the times of each grandchild's tweets are random, the probability that no consecutive pair of tweets in the e-mail are by the same person can be expressed as a/b where a and b are coprime positive integers. What is the value of a + b?

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