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u4 = 108
108 = 8 +3b
100/3= b
S5= 5/2(216 +400/3)
S5= 873,333
=2.5+ (5-1)
= 10 (4)
= 40
Sn = n/2 (a + un)
S5=5/2 (8+U5)
s5 = 5/2 (8+40)
5/2 . 48= 120