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u4= a+3b= 16
-2b= -6
b= 3
a+b=10
a+3=10
a= 7
34= 7+ (n-1) 3
34= 7 + 3n - 3
34= 4 + 3n
30= 3n
n= 10
S10 = 5 (14 + 9 (3)
= 5 (41)
=205
jadikan jawaban terbaik ya, terimakasih ^^