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n= Jumlah suku
U1= 1+1=2
U2= 2+1=3
U3= 3+1=4
U100=100+1=101
u2=n+1=2+1=3
U3=n+1=3+1=4
b.u100= a+(n-1)b
= 2+ (100-1)1
=2+99
=101