Number of 3 digit number in which digit at hundredth place is greater than other two ?

Explanation

Total numbers of combinations

`0^2+1^2+22^2+3^2+....+8^2`

n=8

formula=`(n(2n+1)(n+1))/6`

`=(8(8*2+1)(8+1))/6`

`=194`.