EXAMPLE 3 EXERCISE 12.2

Consider the sets A and B of Example 12. Find A nnBdot

Which of the following is not an AP? (a) -1.2, 0.8, 2.8, .... (b) 3, 3+ sqrt(2), 3+ 2sqrt(2), 3+3sqrt(2), ...... (c) 4/3, 7/3, 9/3, 12/3, ..... (d) -1/5, -2/5, -3/5,...

Three solutions P, Q and R have pH value of 3.5, · 5.2 and 12.2 respectively. Which one of these is a : Weak acid ?

Three solutions P, Q and R have pH value of 3.5, · 5.2 and 12.2 respectively. Which one of these is a : Strong alkali ?

Evaluate: (1.2 xx 1.2 + 1.2 xx 0.3 + 0.3 xx 0.3)/(1.2 xx 1.2 xx 1.2- 0.3 xx 0.3 xx 0.3)

(5 1/4-3 1/3) = (a)(12/23) (b) 2 (c) (1 11/12) (d) (11/12)

Class 12 ncert maths solution chapter vector algebra exercise 10.2 Qno.4,5

For solving each pair of equations, in this exercise, use the method of elimination by equation coefficiients : (5y)/(2) - (x)/(3) =8 (y)/(2) + (5x)/(3) = 12

If |(x^2+x,x+1,x-2),(2x^2+3x-1,3x,3x-3),(x^2+2x+3,2x-1,2x-1)|=ax-12 then 'a' is equal to (1) 12 (2) 24 (3) -12 (4) -24

If |(x^2+x,x+1,x-2),(2x^2+3x-1,3x,3x-3),(x^2+2x+3,2x-1,2x-1)|=ax-12 then 'a' is equal to (1) 12 (2) 24 (3) -12 (4) -24