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If 7 times the 7^th term …

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If 7 times the 7^th term of an AP is equal to 11 timesits 11^th term then find its 18^th term

    • Posted by Yash Balhra 6 years, 10 months ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Savrit Mor 6 years, 10 months ago

    7(a+6d)=11(a+10d) 7a+42d=11a+110d 7a-11a=110d-42d -4a= 68d a=-17d a+17d=0 a+(18-1)d=0 18th term = 0

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