5/2,4,11/2,7... nilai U13=...

Diket :
5/2,4,11/2,7
a = 2,5

Jawab :
5/2 , 4 , 11/2 , 7 = 2,5 ; 4 ; 5,5 ; 7
b = 4-5/2 = 8-5/2 = 3/2

U13 = a+(13-1)b
U13 = 5/2 + 12(3/2)
U13 = 5/2 + 18
U13 = 5+36/2
U13 = 41/2

Maaf jika ad kesalahan :)