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The sum of first n terms …

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The sum of first n terms of an AP is 210 and sum of its first (n-1) terms is 171.if the first term is 3 then write the arithmetic progression

    • Posted by Nayana M S 2 years, 8 months ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Preeti Dabral 2 years, 8 months ago

    To find the AP if the sum of first n terms of arithmetic progression is 210 and sum of its first (n-1) terms is 171. If the first term is 3 .

    As we know that if AP has n terms,then after removing (n-1) terms,we are left with the last term.

    ACF, last term is 210-171

    l= 39

    a= 3

    0Thank You

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