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U1 = 4.1 - 5 = -1
U2 = 4.2 - 5 = 3
b = U2 - U1 = 3 - (-1) = 4
Sn = n/2(2a + (n - 1)b)
S10 = 10/2(2.(-1) + (10 - 1).4)
S10 = 5(-2 + 36)
S10 = 170