How many 4 digit numbers can be formed using the digits 1,2,3,4,5,6,7, where repetition is not allowed.
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Total 4 digit numbers that can be formed using the digits 1, 2 , 3, 4,5,6,7 is:
= 7 P 4
=7 ! / 3 !
= 7 * 6 * 5 * 4* 3 ! / 3!
= 7 *6*5*4
=840
= 7 P 4
=7 ! / 3 !
= 7 * 6 * 5 * 4* 3 ! / 3!
= 7 *6*5*4
=840
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