Single Answer MCQ
Q-00052009
Which sequence describes the sum of the first n natural numbers?
1
1 + 2 + 3 + ... + n = n(n + 1)/2
2
1 + 2 + 3 + ... + n = n^2
3
1 + 2 + 3 + ... + n = n^3
4
1 + 2 + 3 + ... + n = n(n - 1)/2
Answer and Solution
Answer
A. 1 + 2 + 3 + ... + n = n(n + 1)/2
Solution:
The formula for the sum of the first n natural numbers is n(n + 1)/2, making option 1 correct.
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