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
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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