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If nth term of an AP …

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If nth term of an AP is 5-2n. what is the sum of n termt??

    • Posted by Amrit Keshari Patra 4 years, 8 months ago

    CBSE > Class 10 > Mathematics
    • 2 answers

    Vanshika Goyal 4 years, 8 months ago

    n=1 5-2*1=3 Similarly when n=2 5-2*2=1 n=3 5-2*3=-1 and so on........... This forms an AP =3,1,-1 a=3 & d=-2 Sn =n/2[3+5-2n] =n/2[8-2n] =n/2*2(4-n) =n(4-n)

    0Thank You

    Khushi Keshri 4 years, 8 months ago

    N1=5-2(1)=3 ;n2 =5-2(2)=4 a=3;d=4-3 =1 sn=n/2(2a(n-1)d

    0Thank You

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