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Автор Survivor, история, 6 лет назад, По-английски

Hi Everyone!
I am trying to solving this codechef problem.
I am stuck in the theoretical mathematics part of it.
The editorial explains some equations which i am unable to understand.
Can somebody please explain me how these equations are formed and worked along and where does this algebraic representation of pascal triangle given in the editorial come from?
Any help is appreciated.
Thanks.

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6 лет назад, # |
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Give as much downvotes you want, it doesn't matters to me, but someone please explain me the logic behind this problem.

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6 лет назад, # |
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Pascal triangle comes from a famous French mathematician called Blaise Pascal. It is widely used, specially in combinatorics theory.

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