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the next one is 1234
They would both be 25.
it is 31818 - 8 = 1010 - 4 = 66 - 2 = 44 - 1 = 3
d
175175
Next three letters are: e n d
In the series, Z3 Y6 X9 W12, then next step is V15. The letters in the series on going backward from Z to V and the numbers are in multiples of 3.
S
fug
c
jj
emae
assa
20? Just a guess
A single number, such as 12848384 does not make a series.
V
tricky 1?? Not so tricky, they are the first letters of the months of the year, so the next letters would be, S, O, and N