# Math

A bag contains equal numbers of red, blue, and yellow marbles. A student chooses a marble at random. What is the relationship between the probability that the marble is red and the probability that the marble is not red?

A) P(red) = P(not red)
B) P(red) = - P(not red)
C) P(red) = P(not red) -1
D) P(red) = 1 - P(not red)

Is it B??

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1. p red =1/3
p not red = 2/3
so
p red = 1 - p not red

IN OTHER WORDS
It is either red or not red, period
so Pred + Pnot red = 1
D

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