The value of `2^-2` is :
a)4
b)1/4
c)2
d)1/2

1.If |[2x,-1],[4,2]|=|[3,0],[2,1]| ,then value of x is (a) 3 (b) 2/3 (c) 3/2 (d) -1/4

If [(2a+b,a-2b),(5c-d,4c+3d)]=[(4,-3),(11,24)] then the value of a+b-c+2d is (a) 8 (b) 10 (c) 4 (d) -8

If sin A+sin^(2)A=1, then the value of cos^(2)A+cos^(4)A is 2(b)1(c)-2(d)0

If (a)/(3)=(b)/(4)=(c)/(7), the value of (a+b+c)-:c is (a) (1)/(7)(b)(1)/(2)(c)2(d)7

If 49a^(2)-b=(7a+(1)/(2))(7a-(1)/(2)), then the value of b is 0( b) (1)/(4)(c)(1)/(sqrt(2))(d)(1)/(2)

Let A and B are events of an experiment and P(A)=1/4,P(A uu B)=1/2, then value of P(B/A^(c)) is 2/3 b.1/3 c.5/6 d.1/2

The value of {8^(-(4)/(3))-:2^(-2))^((1)/(2)) is (1)/(2)(b)2(c)(1)/(4) (d) 4

If (a)/(b+c)=(b)/(c+a)=(c)/(a+b)=K, then the value of K is +-(1)/(2)(b)(1)/(2) or -1(c)-1(d)(1)/(2)

If the sum to infinity of the series 1+2r+3r^(2)+4r^(3)+ is 9/4, then value of r is (a)1/2 b.1/3 c.1/4 d.none of these

The line y=mx+1 is a tangent to the curve y^2=4x if the value of m is (A) 1 (B) 2 (C) 3 (D) 1/2 .