# how many rolls to get at least 99% prob of rolling 4, 5, or 6 at least twice

#### LilScogsy

##### New member
How often do you have to throw a fair die to have a probability of at least99% to see a number greater or equal 4 at least once?

#### Subhotosh Khan

##### Super Moderator
Staff member
How often do you have to throw a fair die to have a probability of at least99% to see a number greater or equal 4 at least once?

Please share your work with us ...even if you know it is wrong

If you are stuck at the beginning tell us and we'll start with the definitions.

Here is an idea. If one tosses a die ten times, the probability of getting no result greater than 3 is $$\displaystyle \left(\dfrac{1}{2}\right)^{10}$$. That is no success, so what is at least one success?