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If the nth term of an …

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If the nth term of an AP is (2n+1).find the sum of firstn terms of the AP

    • Posted by Sanjukta Majhi 5 years, 5 months ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Ujjawal Kumar 5 years, 5 months ago

    Let, first term is A1=2×1+1 =3 Second term A2=2×3+1 =7 Now, D=A2 - A1 D=7 - 3 D= 4 Then, sum of first (n) terms Sn = n/2[2a+(n-1)d] Sn =n/2[2×3+(n-1)4] Sn=n/2[6+4n-4] Sn=n/2[2+4n] Sn=n ^2+n [Hence, Sn=n square +n]

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