What are the pattern conbination between these number 18 48 88 128 178 38 68

1 answer:

7 0

18+30=48
48+40=88
88+40=128
128+50=178

Thats all i found so far in the pattern
30,40,40,50
then it drops
by 140 then adds by 30..

I dont know how else to explain it

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