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U2=a+b=19~a=19-b
U5=a+4b=31
(19-b)+4b=31
19+3b=31
3b=31-19
3b=12
b=4
a=19-4=15
S24=1/2n(2a+(n-1)b)
1/2.24(2.15+23.4)
12(30+92)
12.122=......hitung sendiri yah
U2=a+b=19~a=19-b
U5=a+4b=31
(19-b)+4b=31
19+3b=31
3b=31-19
3b=12
b=4
a=19-4=15
S24=1/2n(2a+(n-1)b)
1/2.24(2.15+23.4)
12(30+92)
12.122= 1464