This is a mathematical challenge, and it's been said that:
If you're an engineer, you should be able to solve it in (under) three minutes,
If you're an architect, in three hours;
If you're a doctor, in six hours;
If you're an accountant, in three months and
If you're a lawyer, probably never.
What is the missing number in this logical series?
1, 2, 6, 42, 1806, ____???
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For example, 2 = 1*(1+1)
6 = 2*(2+1)
42 = 6*(6+1)
1806 = 42*(42+1)