start with r and decrease by 1 until reached r = 0 Binomial Expansion (find a specific term) ₙCᵣ (a)ⁿ⁻ʳ (b)ʳ, r is one less than the term needed 最好的學習方式。免費註冊。 註冊代表你接受Quizlet的服務條款和隱私政策...