There are 100229 threes and 100106 nines. A table of all the digit frequencies can be found at http://www.super-computing.org/pi-decimal_current.html
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108
It could be: 5*90 = 5
(9*9)+9+9+(9/9) = 100
Oh, isn't that a happy little question! If we look closely, we can see that there are 20 numbers from 1 to 100 that contain the digit 9. Each of those numbers is like a little friend peeking out from the canvas, adding a touch of joy to our day. So, go ahead and count those 9s with a smile on your face!
73 = |- (sqrt(9!))/9 -| + 9 - sqrt 9 [ceiling]= |_ sqrt sqrt sqrt sqrt sqrt sqrt sqrt 139! _|{the rounded-down 128th-root of 139!; since we can make 139 with fournines, this gives us another way to make 73 with four nines}Another option that you may find is simpler:Noting that 9 to the power zero equals 1, then:73 = (9 x 9) - 9 + 9 0= 81 - 9 + 1 = 73