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nomor:
1. C
Un= 10n-7
U5= 50-7=43
U7= 70-7=63
JADI 63+43=106
2. A
U4=4(3.4+2)=56
U6=6(3.6+2)=120
U8=8(3.8+2)=208
U14=14(3.14+2)=616
OKAAAY:)
u50 = a+ (n -1)b
= 6+(50-1)2
=6+49.2
=6+98= 104