Question 1027097: A bag contains seven red marbles three blue marbles and one green marble. Find P (not blue)
Answer by mathmate(429)   (Show Source):
You can put this solution on YOUR website!
Question:
A bag contains seven red marbles three blue marbles and one green marble. Find P (not blue)
Solution:
The bag contains only blue marbles, and either red or green marbles.
If the marble is not blue, it must be either red or green.
There are 3 blue marbles.
There are (7+1)=8 either red or green marbles
Total number of marbles = 3+8 =11
Assuming random pick of the marbles and that all marbles have equal probability of being picked, then
P(not blue) = P(red or green) = number of red/green marbles / total number of marbles.
I will leave you to replace the right-hand side with numbers to finish the answer.
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