Biased spinner question

mathsdummy

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Oct 24, 2014
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When the pointer is spun, the score is either 1,2,3 or 4.
the probability that the score is 1 is 0.3
the probability that the score is 2 is 0.6

1. A boy spins the pointer twice. Find the probability that the score is 2 exactly once.




Thank you in advance:)
 
To be "2 exactly once" in two spins the two spins must be (2, 1), (2, 3), (2, 4), (1, 2), (3, 2), (4, 2). You should be able to determine the probability of each of those.
 
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