Consider two-digit numbers which remain the same when the digits interchange their positions. What is the average of such two-digit numbers?
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
Which number will fit in '?' place in the following series?
12, 23, 45, 89, ?
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