Puzzles Questions

19. Draw the missing figure in the above sequence?
 
Answer

The large circle moves 45deg clockwise and alternates white/black. The centre dot alternates black/white.

20. What comes next in this series?
1, 2, 6, 24, 120, 720, ?
Answer
5040.
Multiply each number by 2, 3, 4, 5 and 6 and (finally) 7.
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