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OpenStudy (anonymous):
Find the number of permutations of the first 10 letters of the alphabet taking 2 letters at a time.
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OpenStudy (anonymous):
permutation: so we need to find what 'n' is, what would that be?
OpenStudy (anonymous):
10?
OpenStudy (anonymous):
yep, so then r=2 now plug it into the premutation equatoin
OpenStudy (anonymous):
I have to go now, cya
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