1,2,3,4,5
123
125
135
153
145
143
215
213
231
251
235
253
351
315
345
341
321
325
421
423
425
431
435
453
451
513
521
523
543
541
64 if repetition is allowed.24 if repetition is not allowed.
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
If repetition of digits isn't allowed, then no13-digit sequencescan be formed from only 5 digits.
15 of them.
125
64 if repetition is allowed.24 if repetition is not allowed.
If repetition of digits is allowed, then 56 can.If repetition of digits is not allowed, then only 18 can.
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
If repetition of digits isn't allowed, then no13-digit sequencescan be formed from only 5 digits.
Assuming that the first digit can't be zero: If repetition of digits is permitted: (5 x 6 x 6) = 180 numbers of 3 digits. If repetition of digits is not permitted: (5 x 5 x 4) = 100 numbers of 3 digits.
15 of them.
-123456787
125
33 = 27 with repetition, 3! = 3*2*1 = 6 without repetition.
290
24
24 three digit numbers if repetition of digits is not allowed. 4P3 = 24.If repetition of digits is allowed then we have:For 3 repetitions, 4 three digit numbers.For 2 repetitions, 36 three digit numbers.So we have a total of 64 three digit numbers if repetition of digits is allowed.