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Question
The 10th term of the G.P. $$1, -a, a^2, -a^3, ..........$$ is ______.
Options
$$a^9$$
$$-a^{10}$$
$$-a^{11}$$
$$-a^9$$
MCQ
Fill in the Blanks
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Solution
The 10th term of the G.P. $$1, -a, a^2, -a^3, ..........$$ is –a9.
Explanation:
The common ratio is $$-a$$, so $$T_{10}=1\times(-a)^9=-a^9$$.
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