In a geometric progression consisting of positive terms, each term equals the sum of the next two terns. Then the common ratio of its progression is equals
${\sqrt 5 }$
$\,{1 \over 2}\left( {\sqrt 5 - 1} \right)$
${1 \over 2}\left( {1 - \sqrt 5 } \right)$
${1 \over 2}\sqrt 5 $.
Solution
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