What is the sum of the first 23 natural numbers (starting from 1)?  Choose the correct choice from the following options: A) 256 B) 266 C) 276 D) 286 E) 296

Rationale: the sum of n natural numbers = n * ( n + 1 ) / 2 = 23 * 24 / 2 = 276 the answer is c .
Answer: C