Which of the following option is wrong about natural numbers

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Which of the following option is wrong about natural numbers?

A. Sum of first n natural numbers can be calculated by using Iteration method

B. Sum of first n natural numbers can be calculated by using Recursion method

C. Sum of first n natural numbers can be calculated by using Binomial coefficient method

D. No method is prescribed to calculate sum of first n natural number

Answer: Option D

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