What is the Arithmetic mean of the first n natural numbers ?

1.	What is the Arithmetic mean of the first n natural numbers ?
A.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>n(n + 1 )</center></td></tr><tr><td style="text-align: center;">2</td></tr></table>
B.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>n + 1 </center></td></tr><tr><td style="text-align: center;">2</td></tr></table>
C.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>n<sup>2</sup>(n + 1 )</center></td></tr><tr><td style="text-align: center;">2</td></tr></table>
D.	2(n + 1)
Answer» C. <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>n<sup>2</sup>(n + 1 )</center></td></tr><tr><td style="text-align: center;">2</td></tr></table>

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What is the Arithmetic mean of the first n natural numbers ?

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