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S20= 20/2 (2a+(20-I)b)=230
= I0(2a+I9b) = 230
20a+I90b = 230 ....pers I
Un=a+(n-I)b
U3=a+(3-I)b = -II
a+2b = -II ... pers 2 dieliminasi
20a+I90b=230
a+ 2b. = - II disamakan a (dikali 20)
20a+I90b= 230
20a+ 40b=-220 dikurangi
I50b=450
b= 3
U3=a+2b=-II
a+2(3)=-II
a. = -I7
SI0= I0/2 (2.(-I7)+(I0-I)3)
= 5 (-34+27)
= 5 (-7)
= -35
S20 = 10(2a + 19 b) = 230 --->
20a + 190b = 230 ... persamaan (2)
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-150 b = -450
b = 3
a + 2.3 = -11
a = -11 - 6 = -17
S10 = 5(2.-17 + (9)3) = 5(-34 + 27) = 5(-7) = -35 = B