How many ways can you make a 3-letter arrangement out of the letters in the word TRAPEZOID? This is a (permutation or combination.) There are ways to make 3-letter arrangements.

Permutation

504 ways

Step-by-step explanation:

The difference between combinations and permutations is ordering. With permutations we DO care about the order of the elements, whereas with combinations we don't.

In your graphing calculator, type

nPr(9,3)

(9 letters in trapezoid, 3 letter combos)

and it returns 504.

9.44 times faster.

Step-by-step explanation: