Which of the following is incorrect?
(a) ⁿCᵣ = ⁿC n ₋ ᵣ (b) ⁿCᵣ = ⁿ ⁻ ¹Cᵣ + ⁿCn₋ ᵣ
(c) ⁿCᵣ = ⁿ ⁻ ¹Cᵣ + ⁿ ⁻ ¹Cᵣ ₋ ₁ (d) r ! ⁿCᵣ = ⁿPᵣ
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