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u5= a+4b =13
u7= a+6b = 5 dieliminasi menghasilkan b = -4
b=-4 disubstitusi menghasilkan a=29
a. U6= a + 5b = 9
b. S4 = n/2 (2a+(n-1)b) = 92
semoga benar :)
a. U6 = 9
b. S4?