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OpenStudy (anonymous):
can the sum of the first few consecutive terms of the arithmetic sequence 5, 7, 9... be 140?what about 240?
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OpenStudy (anonymous):
Use the formula Sum = n/2 (2a + (n-1) d) so the first one: 140 = n/2 (10 + (n-1)2) and see if n comes out exactly...
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