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Given a= 7, a13= 35, find …

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Given a= 7, a13= 35, find d and S13

    • Posted by Ritika Lahiri 7 years, 1 month ago

    CBSE > Class 10 > Mathematics
    • 2 answers

    Ansh Verma 7 years, 1 month ago

    we know a=7 so a(n)=a+(n-1)d a13=a+(13-1)d putting values 35=7+(13-1)d 35=7+12d So d=28\12 d=7\3 S13=13\2(a+l) =13\2(7+35) =13\2(42) =273 ans

    2Thank You

    Sparsh Anand 7 years, 1 month ago

    Hello mate!! a= 7 a13= 35 We know that, an= a+(n-1)d a13= 7+(13-1)d 35=7+12d 35-7= 12d 28= 12d Therefore, d= 28/12 d= 7/3 Sn= n/2(2a+(n-1)d) s13= 13/2(2X 7+(13-1)7/3 =13/2(14+12X7/3) = 13/2(14+28) = 13/2X 42 = 13X 21 = 273

    3Thank You

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