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if the the sum of the 1st n terms of an ap iS given by sn=5n² + 3n. find its nth term

    • Posted by Abhishek Singh 7 years, 3 months ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Nikki Kushwah 7 years, 3 months ago

    S1=5×1×1+3×1 =8 a1=8 S2=5×2×2+3×2 =26 a1+a2=26 8+a2=26 a2=18 d=a2-a1 =18-8 d =10 an=a+(n-1)d =8+(n-1)10 =8+10n-10 an=10n-2

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