The average of the two- digit numbers, which remain the same when the digits interchange their positions, is:

A    21

B    43

C    55

D    65

Solution

Correct Answer: Option C

 

The average of two-digit numbers, which remain the same when the digits interchange their positions, is .. 11,22,33,44,55,66,77,88,99

average is=(11+22+33+44+55+66+77+88+99)/9

 

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