Let ( a(n) ) be a G.P. such that ( a(4))...

Let `( a_(n)` ) be a G.P. such that `( a_(4))/( a_(6)) =( 1)/( 4)` and `a_(2) + a_(5) = 216` . Then `a_(1) = `

7 or `(54)/(7)`

8 or `(108)/(7)`

12 or `(108)(7)`

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