In each of the following cases, find A-B and B-A:
A = {3,6,12,15,18,21},B={4,8,12,15,18,21}

Find the (a) union (b) intersection of the following pair of sets : A = {2,4,6,8}, B= {6, 8, 10, 12}.

Find the mode of the following data in each case : 7, 9, 12, 13, 7, 12, 15, 7, 12, 7, 25, 18,7

In the following, state whether A = B or not: A = { 4, 8, 12, 16 } B = {8,4, 16,18}

Find each of the following products (-15)xx0xx(-18)

Find each of the following products: (-15)xx0xx(-18)

Verify a-(-b) = a+b for the following values of a and b. a = 21, b = 18

Find the median of the following data: 15,6,16,8,22,21,9,18,25

Find the mode of the following data: 12, 14, 12, 16, 15, 13, 14, 18, 19, 12, 14, 15, 16, 15, 16, 16, 15,17, 13, 16, 16, 15, 15, 13, 15, 17, 15, 14, 15, 13, 15, 14

Find the variance of the following data : 6, 8, 10, 12, 14, 16, 18, 20, 22, 24.