a and b are +ve integers. a,-4,b form a geometric sequence, and -4,b,a form an arithmetric sequence.
(a) Find the value of ab.
(b) Find the values of a and b.
(c) (i) Find the sum to infinity of the geometric sequence a,-4,b,... .
(ii) Find the sum to infinity of all the terms that are +ve in the geometric sequence a,-4,b.

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@hartnn

if x,y,z form an geometric sequence,
then \(y^2 =xz\)
so, what about
a,-4 and b ?

ab=(-4)^2=16
why?

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