Open Question: Let Sn be the sum of the first n terms of an arithmetic sequence, whose first three terms are u1, u2,and u3.?

it is known that S1=7, and S2=18 A.) Write down u1 B.) caculate the common difference of the sequence.
C.) Caculate u4

Source:Open Question: Let Sn be the sum of the first n terms of an arithmetic sequence, whose first three terms are u1, u2,and u3.?

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Open Question: Let Sn be the sum of the first n terms of an arithmetic sequence, whose first three terms are u1, u2,and u3.?

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Open Question: Let Sn be the sum of the first n terms of an arithmetic sequence, whose first three terms are u1, u2,and u3.?

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