Need help with a probability homework question

[chelsiepoo]

An erratic floppy disk drive has a history of one error in every 21 tries. What is the probability of no errors in the next 5 tries? Round your answer to the nearest thousandth.

I know the probability of one error is 1/21 and the probability of no error is 20/21. I'm stuck how to finish the problem. Help!!

 

[galactus]

Since the probability of no error is 20/21, the probability of 5 consecutive no errors would be

\(\displaystyle \left(\frac{20}{21}\right)^{5}\)