1,000 numbers
000 - 999
unless you include the use of decimals in which case it will be 0.00 - 9.99, 10.0-99.9, 100-999, which I believe is 2,800 numbers.
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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
100,000
12
24
There are 504 such numbers.