2 Matching Annotations
- Apr 2024
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math.libretexts.org math.libretexts.org
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(a+b)5(c+d)6=∑5r=0(5r)arb5−r+∑4s=0(4s)csd4−s(a+b)5(c+d)6=∑r=05(5r)arb5−r+∑s=04(4s)csd4−s(a + b)^5 (c + d)^6 = \sum_{r=0}^{5} \binom{5}{r} a^rb^{5-r} + \sum_{s=0}^{4} \binom{4}{s} c^sd^{4-s} .
This equation is not the same as quation 4) in Exercise 3.3.1.
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93
$$\tbinom{9}{3}$$
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