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a series in AP, the Avg is always the (first+last term)/2
here (1+15)/2=8
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Bunuel
What is the average of the first 15 positive integers?

(A) 7

(B) 7.5

(C) 8

(D) 8.5

(E) 9

Sum of First 15 positive numbers is \(15*\frac{16}{2}\)

Now, Average of these numbers will be \(\frac{15*16}{2*15} = \frac{16}{2} = 8\) , Hence Answer must be (C)
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