Chef and letters

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The chef has $N$ letters with him. Each letter contains the name of the person who sent it. He wants to choose 3 letters such that the following conditions are met:- 1. Selected letters must be from the person whose name start with $A$,$C$,$M$,$H$ or $R$. 2. All three selected letters have to be from a different person. How many such ways are there to choose three letters, disregarding order?

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solution.cppC++17

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