Question

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

Answer 1

\[4P2\]

Answer 2

=12

Answer 3

how

Answer 4

why not 4c 2

Answer 5

That's because the order of the numbers forming the integer matters. Each integer can be only be used once.

Answer 6

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.

Answer 7

Thanks

Answer 8

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