Consider two-digit numbers which remain the same when the digits interchange their positions. What is the average of such two-digit numbers?

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Accepted Answer

All such 2 digit numbers are 11,22,33,44....... upto 99 Forms an AP So sum = n/2(a+l) = 9/2(11+99) Average = sum/9 = ½(11+99) = 55

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