if 7 times the 7th term of an A.P is equal to 11 times its eleventh term , what will be its 18th term?

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  1. 7(a+6d) = 11(a+10d)
    7a+42d = 11a+110d
    4a+68d = 0
    a+17d = 0

    T18 = a+17d = 0

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