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if 7 times the 7th term of an A.P is equal to 11 times its 11th term show that the 18th term of an A.p. is zero

    • Posted by Karan Gautam 6 years, 6 months ago

    CBSE > Class 11 > Mathematics
    • 1 answers

    Deepti Choudhary 6 years, 6 months ago

    7(a+6d)=11(a+10d) 7a+42d=11a+110d -4a. = 110d-42d -4a. =. 68d a = -17d A18=a+17d =.-17d-17d = 0

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