6. 1 Let T, be the rth term of a sequence, for r = 1, 2, 3, ....... If 3T+1 = Tr and T == then the 243 value of (T,T,,,) is 27 (b) 8 81 (c) 8 The negation of the compound proposition pv(~ pvq) is 9 (a) 2 7. (a) (p^~q)^~P 8. (b) (p^~p)v~q (c) (pv q)v p (d) (p^~q)v~ p For the curve defined parametrically as y=3sin 0.cos 0, x = e".sin 0 where = [0,1], the tangent is parallel to x-axis when Ois: (a) 4 9. (b) niksha 6 The variance of 20 observations is 5. If each observation is multiplied by 2 then the new variance of the resulting observations, is: (b) 10 (c) 20 (d) 40 The area bounded by the curve y = (x-1)(x-2)(x-3), x-axis and ordinates x = 0,x=3 is : (a) 5 10. 9 (a) 4 11 4 11 (c) (d) None of these