Find the average of the first 19 natural numbers?  Choose the correct choice from the following choices:
A) 8  B) 9  C) 10  D) 11  E) 12

Rationale: average of the first ' n ' natural numbers = ( n + 1 ) / 2 we get ( 19 + 1 ) / 2 = 10 answer : c
Answer: C