A box contains 42 blue and 22 black pens. A student wants to buy a blu

1.	A box contains 42 blue and 22 black pens. A student wants to buy a blue pen. He picks up apen at random and found it to be black. Holding the pen in his hand, he picks up anotherone at random without looking inside the box. What is the probability that the second pen isblue one?
Answer» probablity of blue=42+21=63 64 probably total 64 pen

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

Answer»

probablity of blue=42+21=63

64 probably total 64 pen