given a,ar,ar^2 ,ar^3 ,... is a GPwith
n→∞ ,r < 1
if : a,x_1 ,x_2 ,ar,x_3 , x_4 ,x_5 ,x_6 ,ar^2 ,
x_7 ,x_8 ,x_9 ,x_(10) ,x_(11) ,x_(12) , ar^3 ,... .
where : a,x_1 ,x_2 ,ar ⇒AP
ar,x_3 ,x_4 ,x_5 ,x_6 ,ar^2 ⇒AP
ar^2 ,x_7 ,x_8 ,x_9 ,x_(10) ,x_(11) ,x_(12) ,ar^3 ⇒AP
...etc
if lim_(n→∞) (x_1 +x_2 +x_3 +...)= ((21)/(16))×(a/(1−r))
what is r ?
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