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Question

Mathematics Question on Probability

A box contains 42 blue and 22 black pens. A student wants to buy a blue pen. He picks up a pen at random and found it to be black. Holding the pen in his hand, he picks up another one at random without looking inside the box. What is the probability that the second pen is blue one?

A

13\frac{1}{3}

B

23\frac{2}{3}

C

2132\frac{21}{32}

D

58\frac{5}{8}

Answer

23\frac{2}{3}

Explanation

Solution

The correct option is (B): 23\frac{2}{3}