9*8*7 = 504 of them.
15 of them.
I take it that you want to make three digits numbers with 8,7,3, and 6 without repetition. The first digit cane be selected from among 4 digits, the second from 3 digits, the third digit from 2, hence the number of three digit numbers that can be formed without repetition is 4 x 3 x 2 = 24
Six (6)
3*2*1 = 6 of them.
64 if repetition is allowed.24 if repetition is not allowed.
15 of them.
I take it that you want to make three digits numbers with 8,7,3, and 6 without repetition. The first digit cane be selected from among 4 digits, the second from 3 digits, the third digit from 2, hence the number of three digit numbers that can be formed without repetition is 4 x 3 x 2 = 24
5040 different 4 digit numbers can be formed with the digits 123456789. This is assuming that no digits are repeated with each combination.
Six (6)
3*2*1 = 6 of them.
64 if repetition is allowed.24 if repetition is not allowed.
# 230 # 203 # 320 # 302
1
If repetition of digits isn't allowed, then no13-digit sequencescan be formed from only 5 digits.
125
There are 4*4*3*2*1 = 96 such numbers.
None :) You only gave us 4 numbers!