Find the probability.

Question

The computer repairman is given 7 computers to fix. He knows that there are 3 bad video cards and 5 failed hard drives. What is the probability that the first computer he tries has both problems?

Answer 1

Hi Susan,

 

 

          The computer repairman is given 7 computers to fix. He knows that there are 3 bad video cards and 5 failed hard drives. What is the probability that the first computer he tries has both problems?

 

 

 

It is helpful for questions like these to draw a Venn diagram.  One large rectangle with two overlapping circles inside.

 

You are given that there are 3 bad video cards and 5 failed hard drives.

Since 3+5=8 and he only has 7 computers to fix, there must be one computer that has both problems

 

ANSWER:  1/7

 

Hope this helps you with the process.