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IfThe sum of first n terms …

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IfThe sum of first n terms of an Ap is given by Sn=2n²+3n . Find the sixteenth term of the Ap

    • Posted by Harpreet Singh 6 years, 2 months ago

    CBSE > Class 10 > Mathematics
    • 2 answers

    Muskan Soni 6 years, 2 months ago

    Let n=1 Then s1=2(1)(1)+3(1) = S1=5=a -----------(1) Let. n=2 S2=2(2)(2)+3(2) S2=14. ------------(2) S2-S1=a2 14-5=9 So. A2=9 Then. D=4 a16=a+15d a16=65 Answer is 65.

    1Thank You

    Harish Gowda 6 years, 2 months ago

    S1=2×1^2+3×1=5 S2=2×2^2+3×2=14 Similarly S1=a1 S2=a2+a1 a2=14-5=9 d=9-5=4 a16=a+15d=5+15×4=65

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