Inactive Tutor answered • 12/01/23
Tutor
New to Wyzant
1 to 9 is 9 digits
10 through 19 = 20 digits
20 through 29 = 20 digits
30 to 39, another 20
40 to 49 20 more
50 to 59 20 more
that's 109
60 to 69 20 more
70 to 79 20 more
80 to 89 20 more
90 to 99 20 more
that's 189
189th digit is 9, the 2nd 9 of 99
you want 185th, so go back 4 digits
...979899
7 is the 185th digit
(185-9)/20= 176/20 = 8 with remainer 16
8+1= 9th group of 20's is the 90's, 16th digit of 90s
would be 7: 9091929394959697
lucky 7
(x-9)/20 = y+R where R=the Remainder
if R is odd then the xth digit is 9
if R is even the xith digit is the unit digit of R +1
R= 16, 6+1=7
if y>0
