A box has 4 defective video tapes and 6 good video tapes. If two tapes are selected at random, what is the probability that they are both good?

You should research how to calculate probability if you're having issues with your homework.

No one is going to do your homework for you, nor should they.

Here's an article on probability:

http://www.life123.com/parenting/education/probability-statistics/calculate-probability.shtml

You can also search "how to calculate probability" in any search engine. Good luck.