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How to make efficient

implementation for C(N,K) using pascals triangle. By creating a function C(N,K) which prints out the value C(1000,250) and C(1000,750) (which should be the same, and why is it the same). I believe you can use the recursive definition based on Pascal's Triangle, but im not sure how! please show and explain thanks!

I also think based on the rules of pascals triangle you only need to calculate the numbers on the upper diagonal. is this wrong?

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