Asked by Anonymous
                Given thatT7=23, Tn=43 and T2n=91. Find a,d and n
            
            
        Answers
                    Answered by
            oobleck
            
    plug and chug
a + 6d = 23
a + (n-1)d = 43
a + (2n-1)d = 91
Now just solve for a,d,n
    
a + 6d = 23
a + (n-1)d = 43
a + (2n-1)d = 91
Now just solve for a,d,n
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