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Unattributed TMUA Mock Set A Paper 1 · Q18

Paper 1Sequences & seriesNumber & counting

{an}\{a_n\} is a geometric sequence of nonzero real numbers. Which of the following holds for any positive integer kk?

Aakak+1>0a_ka_{k+1}>0
Bakak+2>0a_ka_{k+2}>0
Cakak+1ak+2>0a_ka_{k+1}a_{k+2}>0
Dakak+3>0a_ka_{k+3}>0
Eak+1ak+2>0a_{k+1}a_{k+2}>0

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