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What is the greatest number of two-letter arrangements that can be formed from the letters g, r, a, d, and e if each letter is used only once in the arrangement?
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What is the greatest number of two-letter arrangements that can be formed from the letters g, r, a, d, and e if each letter is used only once in the arrangement?

User Antrromet
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Assuming the ordering is important in the arrangement, for the first letter you have a choice of 5, then for the second letter only 4 are left.

The total number of arrangements is 5*4=20
User Carl Poole
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