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U8 = 19
beda = 19-37 = -18 = -6
8-5 3
U5 = 37
a+4b = 37
a+ (4)(-6)= 37
a+(-24)=37
a=37+24
a=61
S60=
n/2 (2a+(n-1)b)
60/2 (2(61) + (59)(-6))
30 (122-356)
30 (-232)
=-6960
(D)
a+4b=37 _
3b=-18
b=-6
a+4b=37
a+4(-6)=37
a=37+24
a=61
Sn = n/2(2a+(n-1)b)
S60= 30(122+59(-6))
= 30(122-354)
= 30(-232)
= -6960(D)