A = {3, 5, 8, 9, 12} ও B = {3, 4, 6, 7, 8, 10, 12, 13} হলে, B \ A নিচের কোনটি?
সঠিক উত্তর: {4, 6, 7, 10, 13}
ব্যাখ্যা: দেওয়া আছে, A = {3, 5, 8, 9, 12} এবং B = {3, 4, 6, 7, 8, 10, 12, 13}।
B \ A = {3, 4, 6, 7, 8, 10, 12, 13} \ {3, 5, 8, 9, 12}
= {4, 6, 7, 10, 13}।
উল্লেখ্য, A \ B = {3, 5, 8, 9, 12} \ {3, 4, 6, 7, 8, 10, 12, 13} = {5, 9}।