2. Probability with Permutations and Combinations
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GEOMETRY.First, let's find the number of distinct permutations of the letters.
E.Therefore, to find the number of distinct permutations we will use the formula for permutations with repetition.
Permutations with Repetition |
The number of distinguishable permutations of n objects in which one of the objects is repeated r_1 times, the other r_2 times, and so on, can be calculated using the following formula. n!/r_1 ! * r_2! * ... * r_k ! |
Eis repeated 2 times. No other letter is repeated. Let's substitute these values into the formula.
Substitute values
Write as a product
Cancel out common factors
Simplify quotient
Multiply
GEOMETRY,the probability that a random permutation of the letters would spell out this word is 120 160.