**Solve Number Puzzle : 3, 5, 1, 7, 9, 5, 13, 15, ?**

Solve this number puzzle.

Which number replaces the question mark?

Solve this math problem to see answer.

Correct Answer : 11

Here, working through the diagram in columns, add 4 to the top number to give the middle one, and add 6 to this number to give the lowest one.

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