Jawabanmu

2013-12-19T18:23:33+07:00
U_2=19  dan  U_5=31

U_5=U_2+3b
31=19+3b
12=3b
b=4

U_1=U_2-1b=19-4=15
U_{24}=U_2+22b=19+22(4)=107

S_{24}= \frac{24}{2}(U_1+U_{24})

S_{24}= 12(15+107)

S_{24}= 12(122)

S_{24}= 1464
B itu apa?
beda
kan barisan aritmatika
oh terus kenapa harus 3B? Apa karena U5-2 Jadi 3b ?
ia, 5-2