Number Series Puzzle

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?




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Replace the question mark in the picture below.

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What does the below image rebus riddle means ?

Rebus Riddle

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John and Jacob are twin brothers. One of them is a liar whereas the other one is a truth-teller.

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Amazing Facts

Gambling

In Canada, a mathematical puzzle must be solved in order to win the lottery to classify it as a “game of skill” not gambling.