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)=4!2!=4×3=12.