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Find the average of the two digit numbers, which remain the same when the digits interchange their positions

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Detailed Solution

Solution: The two digits number which remains the same are

$\begin{array}{l} 11, 22, 33, 44, 55, 66, 77, 88, 99 \\ \frac{11 + 22 + 33 + 44 + 55 + 66 + 77 + 88 + 99}{9} = \frac{495}{9} = 55 \end{array}$

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