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U15= 50
a+14b=50
a+14(-3)=50
a+(-42)=50
a=92
maka, S15=15 : 2(2.92+14b)
= 15:2( 142)
=1065
dit=U1
=U1+(n-1)b
50=U1+(15-1)3
50=U1+14.3
50=U1+42
U1=50-42
U1=8
jawabannya 8
semoga bermanfaat