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if 9th term of an A. …

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if 9th term of an A. P is zero, show that 29th term is twice its 19th term.

    • Posted by Kamini Jayabal 6 years, 9 months ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Akash Maurya 6 years, 9 months ago

    Let us assume that its right that 29th term of the AP is twice its 19th term. Then, a+28d = 2(a+18d).. Upon solving, we get, a+8 = 0.., which is already given an is right for this AP(the 9th term is 0). Thus means that our assumption is right. Hence, proved. ☺

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