statistics
posted by Nesa .
A fair die is tossed and the number facing up is noted. If the probability of getting at least one ‘six’ is to exceed 0.9, how many times should the die be tossed.

The same question was asked a few days ago and it appears in the "related questions" below.
Here's a link to the question:
http://www.jiskha.com/display.cgi?id=1336634629