I was looking at how to find trinomial coefficients with code and I was puzzled with this equation.
$$\binom n k _2 = \binom{n}{-k}_2$$ I know that (nCk) represents n choose k but what does the 2 at the bottom right do compared to binomial?
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I will try to find another white image.. – HC Tang Jun 01 '20 at 06:18
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Your answer likely lies in this MSE post here. – PrincessEev Jun 01 '20 at 06:20
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Thanks for the link ! @EeveeTrainer have flagged it as duplicate. – HC Tang Jun 01 '20 at 06:22