2625
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Not couting 1 and 1000, there would be 998 numbers.
1680 any 4 from 8 is factorial 8 divided by factorial 4 8*7*6*5*4*3*2*1/4*3*2*1 = 8*7*6*5 = 1680
648
The value of 9 factorial plus 6 factorial is 363,600
4! (four factorial) = 4 x 3 x 2 x 1 = 24.