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U8 = a+7b=25
---------------------- -
-3b=-9
b = 3
subtitusi :
a+4b=16
a+4.3=16
a+12 =16
a = 4
S22= n/2(2a+(n-1)b)
=22/2(2.4+(22-1)3)
= 11 (8+63)
= 11(71)
= 781
U5= a + (5-1)3 = 16
= a + 12 = 16
= a. = 16-12 = 4
S22 = n/2(2a+(n-1)b)
= 22/2(8 +(22-1)3)
= 11(8+63)
= 11(701)=B. 781