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U 5 =a + 4b= 22
------------------------- -
7b=35
b=35/7
b=5
a+4b=22
a+4(5)=22
a+20=22
a=22-20
a=2
Un=a+(n-1)b
U15=a+(15-1)b
U15=a+14b
U15=2+14(5)
U15=2+70
U15=72
Jawaban C