If 5Cr – 3C2 = 7C1, then r is / » Fundamentals of Business Mathematics solved MCQs / By admin Question: If 5Cr – 3C2 = 7C1, then r is A. 4 B. 3 C. 2 D. both 2 and 3 Answer» d. both 2 and 3 Note: The above multiple-choice question is for all general and Competitive Exams in India.