Ria has 4 green marbles and 8 red marbles. She arranges them in a circle randomly. If the probability that no two green marbles are adjacent is p/q where the positive integers p,q have no common factors other than 1, what is p + q?
(answer the question as fast as possible.)
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0
Answer:
please mark as brainliest
Answered by
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40
C4
7! 8 4!
P
11!
=
8! 7! 4!
4! 4!
11!
=
6 5 4! 8!
11 10 9 8!
=
7
33
P + q = 7 + 33 = 40
Answer is 40
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