MATH: Prove that \[ \frac{1}{a_1}+\frac{1}{a_2}+\frac{1}{a_3}+\cdots+\frac{1}{a_{20}} \] is a natural number.

Saturday, April 1, 2023

Prove that

\[ \frac{1}{a_1}+\frac{1}{a_2}+\frac{1}{a_3}+\cdots+\frac{1}{a_{20}} \] is a natural number.

This is the problem that I picked up from book: Math Around The World Part III which is written by Mr. Lim Phalkun And Mr. Sen Piseth. I just want to share with all of you by picking some best math problems from many books and combine to a document for researching.

Here is the solution for you:

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