Math Book Cambodia: Prove that `1/a_1+1/a_2+1/a_3+...+1/a_20` is a natural number

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Saturday, April 1, 2023

Prove that $1/a_1+1/a_2+1/a_3+...+1/a_20$ 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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