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a=5,d=3,an=50 find n and Sn.

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a=5,d=3,an=50 find n and Sn.

    • Posted by ♦ Omkar Jadhav ♦ 5 years, 2 months ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Yogita Ingle 5 years, 2 months ago

    Given, a=5,d=3,an​=50
    ⇒a+(n−1)d=50
    ⇒5+(n−1)3=50
    ⇒5+3n−3=50
    ⇒3n=48
    ⇒n=16
    ∴S16​=216​[2a+(16−1)d]
    =8[2×5+15×3]
    =440
    Hence, n=16,S16​=440

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