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Question

Show that (21/441/881/6161/32)=2

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Solution

S=21422823162432....

S=214+28+316....

S=214(1+22+34+48....)

S=214(t)

t=1+22+34+48.... (Infinite AGP with a=1,r=12,d=1)

t=a(1r)+dr(1r)2

t=2+2=4

S=2

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