How to solve this sequence and series question?:
9. The locus of point z satisfying Re ( Z 2 )=0 is
(a) point of straight lines.
(b) circle
(c) hyperbola
(d) none of these.
10 If a 1 , a 2 , a 3 are in G.P. with common ratio r, then value of a 3 >4a2 -3a1 holds if
(a) 1<r<3 (b) -3 <r<-1
(c) r>3 or r<1 (d) None
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