Determine the 18th term of the GP whose 5th term is 1 and common ratio is
2/3.
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Step-by-step explanation:
a5=1
r=2/3
ar^4=1
a(2/3)^4=1
a=81/16
a18=ar^17
=81/16*(2/3)^17
=(2/3)^-4*(2/3)^17
=(2/3)^13. ans
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