What sequence is geometric and has 1/4 as it's fifth term and 1/2 as the common ratio?

asked Apr 18, 2018 84.1k views

3 votes

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2 votes

Use
a(i)=a1*r^(i-1)
we know that a(5)=a1*(1/2)^(5-1)=a1/16 = 1/4
solve for a1=(1/4)*16=4
=>
sequence:
4,2,1,1/2,1/4,1/8,1/16,...

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