Asked by keyli
A box contains 7 green, 4 red and 3 blue marbles. One marble is pulled from the box without looking, what is the probability of not getting a red marble?
Work:7+4+3=14
4/14=2/7
Or
7+3=10
4/10=2/5
Which one is correct.
Work:7+4+3=14
4/14=2/7
Or
7+3=10
4/10=2/5
Which one is correct.
Answers
Answered by
Jana
Neither:
7+4+3=14
7+3=10
10/14 (or 5/7) marbles are not red
so you have about a 71% chance of not getting a red marble
7+4+3=14
7+3=10
10/14 (or 5/7) marbles are not red
so you have about a 71% chance of not getting a red marble