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Question
Find the 9th term of the G.P. 2, 1, `1/2`, ......
Sum
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Solution
a = 2
r = `1/2`
`a_n = ar^(n - 1)`
`a_9 = ar^(9 - 1)`
a9 = ar8
= `2 xx (1/2)^8`
= `2 xx 1/2^8`
=`1/2^7`
` a_9 = 1/128`
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