Compute the indicated probabilities in Problems 47 and 48 by referring to the following probability tree: (A)

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Compute the indicated probabilities in Problems 47 and 48 by referring to the following probability tree: 

.3 .7 M N- .4 .6 .2 .8 R S R S

(A) P(N ∩ R) 

(B) P(S)

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