<PRE><B>Question 193422</B>
Sebastian has a test that has 20 questions on it. The first question is worth one point, and each question after the first is worth four points more than the question before it. What is the maximum score 
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It is an arithmetic series:
Formulas
S(n) = (n/2)(a+l) ; a is the 1st term and l is the last
a(n) = a(1) + (n-1)d
a(20) = 1 + 19*4 = 77
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S(20) = (20/2)(1 + 77) = 10*78 = 780
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Cheers,
Stan H.</PRE>