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Sequences and Series Test - 5

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  • Question 1
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    The sum of terms equidistant from the beginning and end in A.P. is equal to

    Solution

    Let the first term of the A.P be a , last term be l and the common difference be d 
    Now the A.P will be of the form a,a+d,a+2d,……….,l−2d ,l-d,l
    Sum of two term equidistant from the beggining and end (say r+1 t term) = a+r d+b-r d=a+b = sum of the first term and last ter

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