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In an AP the first term …

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In an AP the first term is 25 nth term is -17 and sum of first n terms is 60.find the AP

    • Posted by Harry Potter 6 years, 9 months ago

    CBSE > Class 10 > Mathematics
    • 2 answers

    Utkarsh Rajput 6 years, 9 months ago

    a=25,, an=-17,sn=60 25+(n-1)d=-17 25+dn-d=-17 Dn-d=-17-25 Dn-d=42 eq1 Sn=60 N/2*2a+(n-1)d=60 N/2*25+(n-1)d=60 50n+dn²-dn=120 Dn²-49d=120 Solve it then other equation will be formed then use elimination or substitutions method of linear equation to get common difference and get ur AP

    1Thank You

    Dhananjay Udawat 6 years, 9 months ago

    AP IS 25,22,19,16,13,10 d=-3 n=15

    0Thank You

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