Which number will replace the question mark (?) in the following series?
2,3,6,18,108,?

Let's analyze the progression behavior of the sequence:
The series follows a cumulative product pattern where each term is obtained by multiplying the two preceding terms:

3rd term: 2×3=6
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4th term: 3×6=18

5th term: 6×18=108
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6th term (?): 18×108=1944

Hence, the next number in the series is 1944.