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U6 = 12
S6 = 12
maka
pake sn
jadi
S6 = 6: 2 (U1 + U6)
12 = 3 (U1 + 12)
12 = 3U1 + 36
3U1 = 36-12
3U1 = 24
U1 = 24 : 3
U1 = 8
langsung eliminasi aja jadi
U1 = a + (1-1)b
8 = a
U6 = a + (6-1)b
12 = a + 5b
jadi
12= a + 5b
8 = a
4 = 5b
b = 4 : 5
b = 0,8
nah ,
a = 8
b = 0,8
U15 = 8 + (15-1) 0,8
= 8 + 14. 0,8
= 8 + 11,2
= 19,2
maaf ya kalo salah, tapi sepertinya tidak