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Old November 19th, 2008, 04:00 PM
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Default Arithmetic Sequence

Find the first 4 terms of an Arithmetic Sequence with 7th term of 18 and the common difference is 3/2

not exactly sure how to do this thanks in advance
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Old November 19th, 2008, 04:10 PM
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a_n = a_1 + (n-1)d
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