GP members

The geometric sequence has 10 members. The last two members are 2 and -1. Which member is -1/16?

Correct result:

x =  14

Solution:

a9=2 a10=1  q=a10/a9=(1)/2=12=0.5  a(n)=a1 q(n1)  a8=a9/q=2/(0.5)=4  a11=q a10=(0.5) (1)=12=0.5 a12=q a11=(0.5) 0.5=14=0.25 a13=q a12=(0.5) (0.25)=18=0.125 a14=q a13=(0.5) 0.125=116=0.0625  x=14 x>10??



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