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Quantitative Aptitude

Permutation

4 alphabets E...

Question

4 alphabets E, K, S and V, one in each, were purchased from a plastic warehouse. How many ordered pairs of alphabets, to be used as initials, can be formed from them?

A

18

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B

12

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C

14

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D

16

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E

None of these

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Solution

The correct option is B 12
The required number of ordered pairs of alphabets, to be used as initials, can be formed $= P (4, 2) = \frac{4!}{2!} = 4 \times 3 = 12.$

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