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Hard Puzzles Questions and Answers

Puzzles
16. What number should replace the question mark?
Ans: 11.
Sol.
There are two alternate sequences: +3 and -4.
 
17. What number should replace the question mark?
Ans:17.
Sol.
It is the sum of the two digits (9+8) in the quadrant directly opposite.
 
 
18. What comes next?
Ans: 607.
Sol.
X3 +1 at each stage.