it's easy
i am assuming you know programming as you are asking a question of a high standard.
The formula for any number in the traingle is (r-1)!/[(c-1)!*(r-c)!] where r represents row number and c represents column number.
Note:- '!' sign means factorial. Eg:- 5! = 5 x 4 x 3 x 2 x1.
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pascal triangle
Pascal's triangle
The Fifth row of Pascal's triangle has 1,4,6,4,1. The sum is 16.
It was invented by a mathematician named Pascal.