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Sum of first 7 term of …

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Sum of first 7 term of an ap is 49 and that of sum of 17 term of AP is is 289 then find the sum of n term

    • Posted by Mrunalini Awasare 5 years, 11 months ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Yashasvi Jain 5 years, 11 months ago

    S7=7a+21d=49-----(1) S17=17a+136d=289-----(2) d=2, a=1 Sn=n/2[2+(n-1)2] Sn=n2(nsq.)

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