If `a\ a n d\ b` vary inversely, fill in the blanks: (i) a, 8, 2, ..., 5, 1 b, 10, ..., 20, ..., 80 (ii) a, 16, 32, 8, 128 b, 4, ..., ..., 0.5

It x\ a n d\ y vary inversely, fill in the following blanks: (i) x ,2, 16, ..., 8 ,... y ,... ,6 ,4 ,... ,0.25 (ii) x ,16, 32, 8, 128 y, 4 ,... ,... ,0.25 (iii) x,9, ..., 81, 243 y,27, 9, ..., 1

In which of the following tables a and b vary inversely: (i) a 8 16 32 256 \ b 32 16 8 1 (ii) a 9 18 2 12 b 8 4 30 6 (iii) a, 2, 16, 8, 4 b, 40, 5, 10, 20

In which of the following tables, a\ a n d\ b vary directly. Also, find the constant of variation if a\ a n d\ b are in direct variation. (i) a: 4, 7, 21, 28 and b:12, 21, 63, 84 (ii) a: 2.5, 5, 7.5, 10, 15 and b:10, 20, 30, 40, 60 (iii) a:1, 2, 3, 4, 5 and b:2, 1, 6, 3, 2/5

Fill in the blanks. (a)(-8) +[ ]=0 (b) 13+[ ] =0 (c) 12+(-12)= [ ] (d) (-4)+[ ]=-12 (e) [ ] -15=-10

Let A = {1, 2, 3, 4, 5, 6} , B = {2, 4, 6, 8} . Find A - B a n d B - A .

In the following, state whether A = B or not:(i) A = {a , b , c , d} B = {d , c , b , a} (ii) A = { 4, 8, 12 , 16 } B = {8, 4, 16 , 18} (iii) A = {2, 4, 6, 8, 10} B = {x: x is positive even integer and x≤10} (iv) A = {x : x is a multiple of 10} B={10,15,20,25,30,...}

Pick out the solution from the values given in the bracket next to each equation. Show that the other values do not satisfy the equation. (a) 5 = 60 (10 , 5, 12, 15) (b) n + 12 = 20 (12, 8, 20, 0) (c) p - 5 = 5 (0, 10, 5 - 5) (d) q/2 = 7 (7, 2, 10, 14) (e) r - 4 = 0 (4, -4.8.0) (f) x + 4 = 2 (- 2, 0, 2, 4)

Given the sets A = {1, 3, 5} , B = {2,4, 6} and C = {0, 2,4, 6, 8} , which of the following may be considered as universal set (s) for all the three sets A, B and C (i) {0, 1, 2, 3, 4, 5, 6} (ii) phi (iii) {0,1,2,3,4,5,6,7,8,9,10} (iv) {1,2,3,4,5,6,7,8}

Let A={3,6, 12 , 15 , 18 , 21},\ B={4,8, 12 , 16 , 20},\ C={2,4,6,8, 10 , 12 , 14 , 16}a n d\ D={5, 10 , 15 , 20} . Find: B-D

Let A={3,6, 12 , 15 , 18 , 21},\ B={4,8, 12 , 16 , 20},\ C={2,4,6,8, 10 , 12 , 14 , 16}a n d\ D={5, 10 , 15 , 20} . Find: A-B