# Math Help - SIMPLE PROBABILITY Q

1. ## SIMPLE PROBABILITY Q

The sides of a fair six-sided dice are numbered from 1 to 6
The dice is thrown three times
Find the probabilitty that it shows a 1 at least twice.

2. Originally Posted by abey_27
The sides of a fair six-sided dice are numbered from 1 to 6
The dice is thrown three times
Find the probabilitty that it shows a 1 at least twice.
This is a binomial distribution.

$P(X \geq 2) = \sum_{n = 2}^{3} {3 \choose n} \left( \frac{1}{6} \right) ^{n} \left( \frac{1}{6} \right) ^{3 - n}$