Question 406341

{{{a4 = r*a3}}}

{{{a5 = r*a4 = rČa3}}}

{{{r = sqrt(a5/a3) = sqrt(64*3/27*16) = sqrt(4/9) = 2/3}}}

{{{a7 = rČa5 = (4/9)(64/27) = 256/243}}}


{{{a1 = 12}}}

{{{a2 = 8}}}

{{{a3 = 16/3}}}

{{{a4 = 32/9}}}

{{{a5 = 64/27}}}

{{{a6 = 128/81}}}

{{{a7 = 256/243}}}
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{{{an = 18*(2/3)^n}}}