C
J
C
It is the sequence of first differences. If these are all the same (but not 0), then the original sequence is a linear arithmetic sequence. That is, a sequence whose nth term is of the form t(n) = an + b
18 b/c the pattern is +1,+2,+3...
T
d
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the next letter would be 'b'
f
B
i
c
I,V
CRC CBO and COL
m
d
b
c
B