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Un=a+(n-1)b
U3=4+(3-1)b
10=4+2b
2b=10-4
b=6/2=3
Un=a+(n-1)b
Un=4+(n-1)3
Un=4+3n-3
Un=3n+1 -------> rumus Un
U5=3.5+1=16
Sn=n/2(2a+(n-1)b
Sn=n/2(2.4+(n-1)3
Sn=n/2(8+3n-3)
Sn=n/2(3n+5)
Sn=(3n²+5n)/2 --------> rumus Sn