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= 5 + 5(n - 1)
= 5n
B. Un = n²
un= 5.2 (n-1)
misalkan u4=5.2 berpangkat(4-1)
=5.2berpangkat (3)
=5.8=40
B: Sn=a(1-r"n)/(1-r)
Sn=1(1-4"n)/(1-4)
Sn=1(-3"n)/(-3)
Sn=-3'n/-3