[" 14.यदि "A=[[1,2],[4,2]]," Then "|2A|=],[[" (A) "2|A|," (B) "4|A|],[" (C) "8|A|," (D) None of them "]]

Q.4 If A= [[0,1,-2],[-1,0,5],[2,5,0]] , then (a)A'=A (b)A'=-A (c)A'=2A (d) None of these

If x=y=2z and xyz=256, then x=? (a) 2 (b) 4 (c) 8 (d) None of these

If cosA+cos^2A=1 , then sin^2A+sin^4A= (a) -1 (b) 0 (c) 1 (d) None of these

If a/2=b/3=c/4, then a : b : c= (a) 2:3:4 (b) 4:3:2 (c) 3:2:4 (d) None of these

(2^3)^4 = (a) 2^4*3 (b) 2^3*4 (c) (2^4)^3 (d) none of these

(2^3)^4 = 2^4^3 (b) 2^3^4 (2^4)^3 (d) none of these

If a=sum_(r=1)^oo(1/r)^2, b=sum_(r=1)^oo1/((2r-1)^2), then a/b= (A) 5/4 (B) 4/5 (C) 3/4 (D) none of these

If a=sum_(r=1)^oo(1/r)^2, b=sum_(r=1)^oo1/((2r-1)^2), then a/b= (A) 5/4 (B) 4/5 (C) 3/4 (D) none of these

The minimum value of f(x)=x^4-x^2-2x+6 is (a) 6 (b) 4 (c) 8 (d) none of these

2. "(sqrt(8))^((1)/(3))="? (a) "2," (b) "4" (c) "sqrt(2)," (d) "2sqrt(2)"