If `A^3=O ,t h e nI+A+A^2` equals a.`I-A` b. `(I+A^1)^(-1)` c. `(I-A)^(-1)` d. none of these

Let f(x)=(1+x)/(1-x). If A is matrix for which A^(3)=O,thenf(A) is (a)I+A+A^(2)(b)I+2A+2A^(2)(c)I-A-A^(2)(d) none of these

If A is an orthogonal matrix then A^(-1) equals A^(T) b.A c.A^(2) d.none of these

If for the matrix A ,\ A^3=I , then A^(-1)= A^2 (b) A^3 (c) A (d) none of these

If a=1+i, then a^(2) equals 1-i b.2i .(1+i)(1-i) d.(i-1)

If iz^(3)+z^(2)-z+i=0, where i=sqrt(-1) then |z| is equal to 1 (b) (1)/(2)(c)(1)/(4) (d) None of these

If z=(1+2i)/(1-(1-i)^(2)), then arg (z) equals a.0 b.(pi)/(2) c.pi d .non of these

If z=((1+i)/(1-i)), then z^(4) equals a.1b.-1c0d non of these

If (1+i)(1+2i)(1+3i)(1+ni)=a+ib then 2.5.10.17(1+n^(2))=a-ibba^(2)-b^(2)c*a^(2)+b^(2)d none of these

If f(1)=3,f^(prime)(1)=2,f^(1)=4,t h e n(f^(-1))^()(3)= a. 1 b. -1/2 c. -2 d. none of these

If A=[1 2 0-1 1 2 2-1 1],t h e ndet(A d j(A d jA))= 13 (b) 13^2 (c) 13^4 (d) None of these