a) 2+4+6+....+20+...+2n
a=2 , b=2
Un = a+(n-1)b
= 2+(n-1)2
= 2+2n-2
= 2n
Kita ambil n=3
Un=2n
U3=2.3=6 benar
b) 2+7+12+...+22+..+(5n -3)
a=2
b=5
Un= a+(n-1)b
Un= 5+(n-1)2
Un= 5+2n - 2= 2n+3
Ambil n=2
U2= 2.2+3 = 7 benar
c) 1+4+7+...+22+..+(3n-2)
a=1 , b=3
Un= 1+(n-1)3
Un= 1+3n-3 = 3n-2
Ambil n=3
U3= 3.3-2 =7 benar
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a) 2+4+6+....+20+...+2n
a=2 , b=2
Un = a+(n-1)b
= 2+(n-1)2
= 2+2n-2
= 2n
Kita ambil n=3
Un=2n
U3=2.3=6 benar
b) 2+7+12+...+22+..+(5n -3)
a=2
b=5
Un= a+(n-1)b
Un= 5+(n-1)2
Un= 5+2n - 2= 2n+3
Ambil n=2
U2= 2.2+3 = 7 benar
c) 1+4+7+...+22+..+(3n-2)
a=1 , b=3
Un= a+(n-1)b
Un= 1+(n-1)3
Un= 1+3n-3 = 3n-2
Ambil n=3
U3= 3.3-2 =7 benar