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Five letters F, K, R, T and V one in eac...

Five letters F, K, R, T and V one in each were purchased from a plastic warehouse. How many ordered pairs of letters, to be used as initials, can be formed from them?

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The correct Answer is:
20
Number of ordered pairs `=""^(5)P_(2)=(5xx4)=20.`
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RS AGGARWAL-PERMUTATIONS-EXERCISE 8D
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