11. If z satisfies the equation z-2 Z-2 Z+2 Z+2 =1, then minimum value of [z] is equal to: (a) 0 (b) 2 (c) 4 (d) 6 12. A quadratic function f(x) satisfies f(x) 0 for all real x. If f(2) = 0 and f(4) = 12, then the value of f(6) is: (a) 12 (b) 24 (c) 48 (d) 64 13. The largest integral value of x satisfying the inequality (tan '(x))-4(tan '(x))+3>0 is: (a) 0 (b) 1 (c) 2 The constant term in the expansion of (log 10 (logo)-log 100) is: (d) 3 14. (a) 495 (b) 924 (c) 1050 (d) 5050 15. Suppose y is a function of x that satisfies dy 2 and y = 0 at x== dx equal to: (a) 0 (b) 12 (c) 1 (d) 2 then y 3 is