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It is impossible to identify any pattern from one number.
18
Each 4 terms have the pattern: (1st number), (triple the 1st number), (half of the 2nd number), (one more than the 3rd number ---> the new 1st number)10 - 30 - 15 - 1616 - 48 - 24 - 2525 - 75 - 37.5 - 38.5
The best answer this question pictures are needed as guides. See the attached link below named "Guide" for a complete guide to grading these coins!
The number which best completes the sequence below is 20 5 30 6 42 7