Find the $69^{t h}$ term of the G.P. 1, -1, 1, -1, ..........

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-1

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Solution

The correct option is A 1
Clearly, the given GP has first term a=1 and common ratio r=-1.
$∴ a_{69} = a r^{68} \Rightarrow a_{69} = 1 \times (- 1)^{68} = 1$

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