Bunuel wrote:

Tough and Tricky questions: Probability.

There are 5 marbles in a bag - 2 are orange and 3 are blue. If two marbles are pulled from the bag, what is the probability that at least one will be orange?

A) 7/10

B) 3/5

C) 2/5

D) 3/10

E) 1/10

Kudos for a correct solution.Source: Chili Hot GMAT

the probability of none of the marble will be orange is \(\frac{3}{5}\frac{2}{4}\)=\(\frac{3}{10}\)

the probability that at least one will be orange 1-\(\frac{3}{10}\) = \(\frac{7}{10}\)

the answer is A

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