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S15=15/2(2x36+(15+1)6)
=7,5(72+16x6)
=7,5(72+96)
=7,5x168
1260
b = -6
U15 = a + 14b
= 36 + 14(-6)
= 36 + (-84)
= -48
S15 = 7,5 (36+(-84)
S15 = 7,5 (-48)
= -360