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U6 = 8
a + 5b = 8
4 + 5b = 8
5b = 8 - 4
5b = 4
b = 4/5
S10 = n/2 . (2a + (n - 1) . b)
S10 = 10/2 . (2 . 4 + (10 - 1) . 4/5)
S10 = 5 . (8 + 9 . 4/5)
S10 = 5 . (8 + 36/5)
S10 = 5 . (40/5 + 36/5)
S10 = 5 . 76/5
S10 = 76