tolong ya no 2 dan 3

2. a=3 ; b=2
U2013 = a+(n-1) b
= 3+(2013-1)(2)
= 3+(2012)(2)
= 3+4024
= 4027

3. a=2. ; b=2
U100 = a+(n-1) b
= 2+(100-1)(2)
= 2+(99)(2)
= 2+198
= 200