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Four letters E, K, S an V, one in each, ...

Four letters E, K, S an V, one in each, were purchased from a plastic warehouse. How many ordered pairs of letters, to be sued as initials, can be formed from them?

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Total number of letters =`4`
Number of ordered pairs of letters that can be formed like (E, K) or (S, E) etc =`\ ^(4)P_​2`=12
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