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Program to find the sum of AP series

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!       Program to find the sum of AP series
        real::a,d
        integer::n
        write(*,*)'Enter the number of terms, 1st term and common difference:'
        read(*,*)n,a,d
        sum=0
        do i=0,n-1
        term=a+i*d
        sum=sum+term
        end do
        write(*,*)'The sum of the AP series is',sum
        end
       
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