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Which of the following methods used to find the sum of first n natural numbers has the least time complexity?

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Which of the following methods used to find the sum of first n natural numbers has the least time complexity?

(a) Recursion

(b) Iteration

(c) Binomial coefficient

(d) All have equal time complexity

The question was asked by my school principal while I was bunking the class.

Asked question is from Sum of n Natural Numbers using Recursion topic in chapter Recursion of Data Structures & Algorithms II

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The correct answer is (c) Binomial coefficient

For explanation: Recursion and iteration take O(n) time to find the sum of first n natural numbers while binomial coefficient takes O(1) time.

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