1
Question
The average of all the 2 digit numbers that remain the same when their digits are interchanged is
The average of all the 2 digit numbers that remain the same when their digits are interchanged is
Open in App
Solution
The correct option is D 55
2 digit number that remain the same when its digits are interchanged are 11, 22, and 33 and so on. The average will be \frac{11+22+33+44+55+66+77+88+99}{9}=55
PS – The terms are in AP and there are odd number of entries, so the average will be the middle term itself.
2 digit number that remain the same when its digits are interchanged are 11, 22, and 33 and so on. The average will be \frac{11+22+33+44+55+66+77+88+99}{9}=55
PS – The terms are in AP and there are odd number of entries, so the average will be the middle term itself.
Suggest Corrections
1
Similar questions