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U6 = 8 + 5b
U4 + U6 = 40
(8+3b) + (8+5b) = 40
16 + 8b = 40
b = 3
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S10 = n/2 (2a + (n-1)b)
S10 = 10/2 (28 +(9)3)
S10 = 5 (55)
S10 = 275