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suku kedua = 13 + 21 = 34
jawabannya c.21, 34
22. a+b = 7 , 7 + 12 = 19
b = 12 - 7 = 5
maka a = 7 - 5 = 2
maaf 23 dan 24 saya tidak tahu
25. 1, 1, 2, 3, 5, 8, 13, 21, 34, 55
jumlah = 1 + 1 + 2 + 3 + 5 + 8 + 13 + 21 + 34 + 55
= 143
*pola bilangan fibonacci, un =jumlah 2 suku pertama
a+b=19 -->2
substitusi b ke persamaan 2
a+3+a=19
a=8
jika a+b=19
maka b=19-a=11
24. u7=102
misal u2=x
6, x, (6+x), (6+2x), (12+3x), (18+5x), (30+8x)
u7=30+8x
102=30+8x
x=9