math

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How do I approach this problem?

Seven green marbles and three red marbles are randomly placed in Box A and in Box B. Box A holds 4 marbles, while Box B holds 6. What is the probability that Box A has at least 2 green marbles?

• math -

There aren't that many cases
We can just list them , box A first, then Box B

GGGG GGGRRR
GGGR GGGGRR
GGRR GGGGGR
GRRR GGGGGG

Since the order does not matter, that is all
of these have 2 or more R's in boxA
so prob = 2/4 = 1/2

• oops - math -

It asked for at least 2 G's in A, should read more carefully.

so prob of 2 or more G's in box A is 3/4

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