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How many diferrent 9-letter words (real or imaginary) can be formed from the letters in the word ECONOMICS? the ans. must be 90,720
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How many diferrent 9-letter words (real or imaginary) can be formed from the letters in the word ECONOMICS?

the ans. must be 90,720

User Vectoria
by
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2 Answers

3 votes

Answer:

90,720

Explanation:

User Cobrexus
by
7.6k points
3 votes
Permutation with repeated elements (O, twice and C, twice).

10! / 2!2! = 10! / 2 x 2 = 3628800 / 4 = 907200
User Ourania
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