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S3 = 21 = 3/2 (2a + (3-1)b)
14 = 2a + 2b
S5 = 50 = 5/2 (2a + (5-1)b)
20 = 2a + 4b
10 = a + 2b
14 = 2a + 2b
10 = a + 2b
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4 = a
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