69. if j()42r4] then its maximum value is 1 (1) 4/3 (2) 2/3 (3)1 (4) 3/4 70. the function f(x) = 2x' -15x+36x +4 is maximum at x= t47 77 h f(x) = 2r -15x+36x +4

69. If J()42r4] then its maximum value is 1 (1) 4/3 (2) 2/3 (3)1 (4) 3/4 70. The function f(x) = 2x' -15x+36x +4 is maximum at x= T47 77 H f(x) = 2r -15x+36x +4 3ea4 T Ta X= (0) 3 (2) 0 (3) 4 (4) 2 71. The sum of two non-zero numbers is 8. The mininum value of the sum of their reciprocals is (1) 1/4 (2) 1/2 (3) 1/8 (4) None of these (1) 1/4 (2) 1/2 (3) 1/8 (4) 3 t T 72. For given function U=x+y-3x-27y +24, minimum value of U wi!! Qccur at point T 5eU =* +y-3x -27y + 24 U HA GAH RATT (1) (-1,-3) (2) (-1, 3) (3) (1,-3) 4) (1,3)