a,b,c,d = 1,2,4,3
b=2a
c=b+2
d=c-1
7*2=14
14+2=16
16-1=15
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5
The number which best completes the sequence below is:2 9 5 13 10 19 17?
75The number which best completes the sequence 10 30 15 16 48 24 25 is 75.
We can't answer this accurately without knowing the sequence.
18