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.
The value of 210 factorial is: 10582362029223656378427428424334835305758990578716901956235273752 21444875324002101478493690117146739547682653165778925282737606261 89481169051055226066650741189573897273684791411180134039439160066 56189583850100081771168262572567047761626759866125919497564602974 95462825943562173740975441535894820208917507747350125583134608468 24864172030239122128896000000000000000000000000000000000000000000 000000000. This number has 399 digits.
1215! = 1.080911252378 E+3222
There are 2892 digits.
00
1100
210.
4
There are 116 1s in the first 1000 digits of pi.
It can be calculated as factorial 44! = 4x3x2x1= 60
1 is one.
1000
There are 120 of them.