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

33
44
55
66

Correct Answer: 55

Explanation:

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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