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How many numbers can be formed from the ...

How many numbers can be formed from the digits 1, 2, 3, 4 when the repetition is not allowed

A

`"^4P_4`

B

`"^4P_3`

C

`"^4P_1`+`"^4P_2+"^4P_3`

D

`"^4P_1`+`"^4P_2`+`"^4P_3`+`"^4P_4`

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