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16 Jul 2003, 13:12
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I saw one ETS question that had you use I think a formula for arithmetic. Is it really on the test, and why because it's not in the math reference of official guide?
VT
VT
18 Jul 2003, 02:10
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You are not required to know explicit formulas for arithmetic or geometric series. In fact, I discourage my students from even learning "specialized" formula such as sum of 1, 2, ..., n, permutations, combination, binomial, etc. -- only basic formulae like N * average = sum, and D = R * T. Memorizing formulae distracted and discourages the understanding of the underlying principle.
However, you are expected to understand AVERAGES, and, with that understanding, you should be able to find the average and sum of ANY arithmetic sequence with ANY starting number.
However, you are expected to understand AVERAGES, and, with that understanding, you should be able to find the average and sum of ANY arithmetic sequence with ANY starting number.
