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= 54 - 32 / 4
= 22/4
= 5,5
U3 = a + (3-1) b
32 = a + 2. 5,5
32 = a + 11
a = 32 - 11
= 21
S 12 = n/2 ( 2a + (n - 1) b)
= 12/2 ( 2. 21 + (12 - 1). 5,5)
= 6 . (42 + 11. 5,5)
= 6. (42 + 60,5)
= 6. 102,5
= 615