There are various strategies to organize the arithmetic, but the answer certainly comes out as about 0.260476. Some calculators have keys like x y , and these can be useful to calculate expressions of the form 68. Of course, 68 can always be calculated by careful repeated multiplication. The calculator in Microsoft Windows will find 68 through the keystrokes 6, y, 8, =. 2. The probability of winning at a certain game is 0.10. If you play the game 10 times, what is the probability that you win at most once?