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linear algebra - Find det A if A is 3 × 3 and det (2A) = 6 ...
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Prove that $\\binom{n+1}k = \\binom nk + \\binom n {k-1}$
2016年10月29日 · As the title says. Prove that ${n+1 \choose k} = {n \choose k} + {n \choose k-1}$ It looks to me like induction but since there are two variables, I'm not really sure how to …
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