1.

What is the sum of the first 30 natural numbers?(A) 464 (B) 465 (C) 462 (D) 461

Answer»

Correct answer is

(B) 465

Sum of first n natural no.
  = n(n+1)/2

So sum of first 30 natural no. is 
   =30(30+1)/2
   =465


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