What is the sum of the first 23 natural numbers (starting from 1)?
Options:
A) 256  B) 266  C) 276  D) 286  E) 296
The sum of n natural numbers = n*(n+1) / 2 = 23*24/2= 
<gadget id="calculator">23*24/2</gadget>
<output>276</output>
276   The answer is 276.
<result>C</result>
What is the sum of the first 23 natural numbers (starting from 1)?