5. (1 point) Prove (using combinatorics) that the binomial coefficent 126 belongs to the term a4b5 in the expansion (a +
Posted: Thu May 12, 2022 2:30 pm
5. (1 point) Prove (using combinatorics) that the binomial coefficent 126 belongs to the term a4b5 in the expansion (a + b)9. Show all your work to get credit.