Question

The sum of the first natural number and 0 is 1, the sum of the first two natural numbers and 0 is 3, the sum of the first three natural numbers and 0 is 6, and the sum of the first four natural numbers and 0 is 10. Which explicit formula generates the sum of the first n natural numbers and 0?
A) n(n+1)/2
B) 2n-1
C) n(n+4)/4
D) 3n-2

Answer 1

The answer is A, it works with every number mentioned in the question.

Answer 2

The answer to your question is A) n(n + 1)/2

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