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maths

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if the seventh term of an AP is zero,prove that its 27th term is five times its eleventh term of class 10

  • maths - ,

    T7 = a+6d
    T11 = a+10d
    T27 = a+26d

    a+6d = 0
    a = -6d

    T27 = -6d+26d = 20d
    T11 = -6d+10d = 4d

  • maths - ,

    i donno

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