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Count the possible combinations of r letters chosen from the given list P.Q,R,S,T,U; r = 2

1 Answer

4 votes

Answer:

There are 30 possible combinations of picking two letters.

Explanation:

The combinations are defined as


C^(r)_(n)=(n!)/((n-r)!)

Where
n is the total number of elements and
r is the number of letter we are gonna picke, which is two. Using this information, we have


C^(2)_(6)=(6!)/((6-2)!)=(6!)/(4!)=(6 * 5 * 4!)/(4!)=30

Therefore, there are 30 possible combinations of picking two letters.

User Connor Hicks
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