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In AP for many sums we …

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In AP for many sums we let terms like a-d, a, a+d,a+2d,a-2d but how we know that we have to let a-d, a, a+d

    • Posted by R_ Sandhu_ 6 years, 9 months ago

    CBSE > Class 10 > Mathematics
    • 9 answers

    R_ Sandhu_ 6 years, 9 months ago

    If the sum of first n terms of an ap is n and the sum of first n terms is m then show that the sum of its first (m+n) terms is -(m+n)then for this we will let a, a+d,a+2d why

    1Thank You

    Nandini Verma 6 years, 9 months ago

    An Ap is always in the form of a-d,a,a+d....

    1Thank You

    R_ Sandhu_ 6 years, 9 months ago

    But why u let a, a+d,a-d plzz can u explain

    0Thank You

    Amrit Amrit 6 years, 9 months ago

    Sory,,take d as a place of1?

    0Thank You

    Amrit Amrit 6 years, 9 months ago

    Take, a, a+1 and a-1..... These are three terms... Slove you will get answer?

    0Thank You

    R_ Sandhu_ 6 years, 9 months ago

    Find an ap whose sum of first 3 terms is 21 and sum of their squares is 155 ? Now for this which term we will let plzz tell me

    0Thank You

    Amrit Amrit 6 years, 9 months ago

    See the sum becomes 3a and D get cancelled .then it is easy to solve equation

    0Thank You

    R_ Sandhu_ 6 years, 9 months ago

    I got really confused

    0Thank You

    Amrit Amrit 6 years, 9 months ago

    According to given conditions

    0Thank You

    ANSWER
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