The probability of rolling a 5 is 1 out of 6 (\(\frac{\mathrm{1} }{\mathrm{6}}\)), so the probability of NOT rolling a 5 is 1 − \(\frac{\mathrm{1} }{\mathrm{6}}\) , or 5/6 . The probability of not rolling a 5 twice is \(\frac{\mathrm{5} }{\mathrm{6}}\) × \(\frac{\mathrm{5} }{\mathrm{6}}\) , or \(\frac{\mathrm{25} }{\mathrm{36}}\) .