Question 42187
Let us denote the first term by 't1', second term by 't2' and so on.


{{{t2/t1=32/(-64)=-1/2}}}
{{{t3/t2=(-16)/32=-1/2}}}
{{{t4/t3=8/(-16)=-1/2}}}
{{{t5/t4=(-4)/8=-1/2}}}


So, clearly, the numbers are in G.P. or Geometric Progression with common ratio {{{-1/2}}}.