Given S1={a,b,c}S2={a,1,2}, then (S1-S2) Π (S2-S1) is / » Mathematics for Economic Analysis 1 solved MCQs / By admin Question: Given S1={a,b,c}S2={a,1,2}, then (S1-S2) Π (S2-S1) is A. 1 B. a C. b D. null set Answer» d. null set Note: The above multiple-choice question is for all general and Competitive Exams in India.