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in an ap if tje common diffrenceis equal to -4and the seventh term id 4then find the first term

    • Posted by Arshdeep Deep 6 years, 6 months ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Sia ? 6 years, 6 months ago

    an = a + (n - 1)d
    a7 = a + (7 - 1)d
    a + 6d = 4
    a + 6(-4) = 4
    {tex}\Rightarrow{/tex} a = 28

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