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If sn=3n+5n² find 20th term

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If sn=3n+5n² find 20th term

    • Posted by Sumit Kumar 7 years, 3 months ago

    CBSE > Class 10 > Mathematics
    • 2 answers

    Khyati Rawat 7 years, 3 months ago

    n=1 S1=A1=3(1)+5(1) A1=8 Similarly S2=A1+A2=26 A2=26-A1=18 d=A2-A1=10 Now,nth term=A1+(n-1)d So 20th term=8+(20-1)10=8+190=198

    0Thank You

    Harshit Mehta 7 years, 3 months ago

    n=20 Sn=3×20+5×400 =60+2000 =2060

    1Thank You

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