Correct Answer - Option 2 : 403.5
Given
Given digits are 5, 6 and 1
Formula used
Average = (sum of all observation)/Number of observation
Calculation
Largest three digit number = 651
Smallest three digit number = 156
Average = (156 + 651)/2
⇒ 807/2
⇒ 403.5
∴ Average of the largest and smallest 3 digit number formed by 5,6 and 1 is 403.5
