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U3=12 , U7=32
Dit:
U10=...?
jwb:
Un=a+(n-1).b
U3=a+(3-1).b=12
U3=a+2b=12...(1)
Un=a+(n-1).b
U7=a+(7-1).b=32
U7=a+6b=32...(2)
U7-U3
a+6b=32
a+2b=12
(-)
6b-2b=32-12
4b=20
b=20÷4
b=5
b=5 , Sub ke 1
a+2b=12
a+2.5=12
a+10=12
a=12-10
a=2
a=2 ,b=5
Un=a+(n-1).b
U10=2+(10-1).5
U10=2+9.5
U10=2+45
U10=47
jdi, U10 adalah 47 (B)
Smoga membntu yaa^^