tolong jawab no 2 dan 4

4. a un=a+(n-1)b
=9+(24-1)-3
=9+(23×(-3))
=9+(-69)
=-60
B. un=a+(n-1)b
=12+(8-1)-3
=12+(7 (-7))
=12+(-49)
=-37
Maaf kalau salah