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Given a=8 an=62 sn=210 find n …

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Given a=8 an=62 sn=210 find n and d

    • Posted by Srijan Mishra 6 years, 2 months ago

    CBSE > Class 10 > Mathematics
    • 5 answers

    Aadya Singh ? 6 years, 2 months ago

    Sn= n/2 (an +a) => 210 = n/2 (62+8) => 420 = 70n => n = 6 . Now, An = a+(n-1)d => 62 = 8+(6-1) d => 54 = 5d => d=54/5 => d = 10.8

    2Thank You

    Jatin Rao 6 years, 2 months ago

    N=6 d=10.8

    0Thank You

    Jatin Rao 6 years, 2 months ago

    N=6 d=20.8

    0Thank You

    Jatin Rao 6 years, 2 months ago

    N=6

    0Thank You

    Aadya Singh ? 6 years, 2 months ago

    n= 6 and d= 10.8

    1Thank You

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