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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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MODERN PUBLICATION-PERMUTATIONS AND COMBINATIONS -EXERCISE 7 (d) Short Answer Type Questions
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  7. How many even numbers of three digits each can be made with the digit...

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