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A pair of dice is rolled until a sum of either 6 or 9 appears. Find the probability that a sum of 6occurs first.

 Jan 31, 2020
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There are 5 ways that a sum of six can occur [ 1,5  2,4  3,3  4,2  5,1 ].

There are 4 ways that a sum of nine can occur [ 6,3  5,4  4,5  3,6  ].

The probability that a sum of six occurs first is 5/9.

 Feb 1, 2020

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