The sum of all 3-digit numbers less than or equal to 500 , that are formed without using the digit "1" and they all are multiple of 11 , is
Question:
The sum of all 3-digit numbers less than or equal to 500 , that are formed without using the digit "1" and they all are multiple of 11 , is
Solution:
$209,220,231, \ldots, 495$
Sum $=\frac{27}{2}(209+495)=9504$
Required $=9501-(231+341+451+319+418)$
7744