Q-11 How many numbers consisting of two digits can be formed from 2, 3 5,7. Each integer is to be used only once

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Q-11 How many numbers consisting of two digits can be formed from 2, 3 5,7. Each integer is to be used only once

Mathematics
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\[4P2\]
=12
how

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Other answers:

why not 4c 2
That's because the order of the numbers forming the integer matters. Each integer can be only be used once.
If you used 4C2, then e.g. 23 and 32 will be counted as one combination. Using 4P2, counts them as two different combinations. They are two distinct integers after all.
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