Question

The sum of the first n natural numbers is a perfect square . The smallest value of n is ?

• A. 5
• B. 6
• C. 7
• D. 8

Answer 1

Answer:

D. 8

Going through the options we get n(n + 1)/2 = 8(8 + 1)/2 = 8 × 9/2 = 72/2 = 36