Asked by lindsay
                find the sum of an A.P.of eleven terms whose first term is 1 and whose last term is 6.
            
            
        Answers
                    Answered by
            Reiny
            
    sum(n) = (n/2)(first + last)
sum(11) = (11/2)(1+6)
= 77/2
    
sum(11) = (11/2)(1+6)
= 77/2
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