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If the sum of first 7 terms of an ap is 49 and that of 17 terms is 289 find the sum of n terms

    • Posted by Yuvaraj Achar 7 years, 2 months ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Aryan Yadav 7 years, 2 months ago

    49=7/2[2a+6d] 14=2a+6d 7=a+3d_________1 34=2a+16d 17=a+8d__________2 a+3d=7 a+8d=17 ______________on sub -5d=-10 d=2 a=1 Sn=n/2{2+(n-1)2} Sn=n×n

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