12,15" and "21

(i)Find the LCM and HCF of the following integers by applying the prime factorisation method:-12,15 and21 (ii)Find the LCM and HCF of the following integers by applying the prime factorisation method:-17,23 and 29 (iii)

Multiple Choice Questions (MCQ) Mode of 9, 12, 15, 18, 21, 25, 27, 7, 8, 3, 11 is

compute variance and S.D. of the following data: 9, 12, 15, 18, 21, 24, 27

Write the following sets using rule method : A = {3, 6, 9, 12, 15, 18, 21}

{9, 12, 15, 18, 21} Which of the following paris of numbers, when added to the set above, will increase the standard deviation of the set? I. 14, 16 II. 9, 21 III. 15,100

If A = {3, 6, 9, 12, 15, 18, 21}, B = { 4, 8, 12, 16, 20 } , C = { 2, 4, 6, 8, 10, 12, 14, 16 }, D = {5, 10, 15, 20 } , find A – D

If A = {3, 6, 9, 12, 15, 18, 21}, B = { 4, 8, 12, 16, 20 } , C = { 2, 4, 6, 8, 10, 12, 14, 16 }, D = {5, 10, 15, 20 } , find B – A

If A = {3, 6, 9, 12, 15, 18, 21}, B = { 4, 8, 12, 16, 20 } , C = { 2, 4, 6, 8, 10, 12, 14, 16 }, D = {5, 10, 15, 20 } , find A – B