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A jar contains only red, white and blue marbles.It contains twice as many red marbles as white marbles and three times as many white marbles as blue marbles. If a marble is choosen at random, what is the probability that it is not red ?

 

A)\(\frac15\)

B)\(\frac25\)

C)\(\frac35\)

D)\(\frac45\)

 

My answer:

\(\begin{array}{rcll} 2r &=&w \\ 3w\;(or\;6r)&=&b \end{array}\)

 

Alltogether there is 9r marbles the probability of choosing red marble is \(\frac19\)

the probability of not choosing red is \(1-\frac19=\frac89\)

 
 Mar 31, 2016

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