During a murder investigation Dr. Watsoff found a piece of paper in the victim's bedroom. "It's a family tree," he said to Sherlock Jones. "But it
is not complete. I wonder how many children Robert has."
Jones just glanced at the family tree and knew right away.
The incomplete family tree:
figure in non-mono font
Paul
_______________|________________
| | |
|
Tom Ann David Robert
_____|_____ _____|____ |
| | | | |
?
Jack Ann Don Sam Peter
___|___ ____|____
| | | |
|
Figure in mono font
Paul
________________|__________________
| | | |
Tom Ann David Robert
_____|_____ ____|____ |
| | | | | ?
Jack Ann Don Sam Peter
___|___ ____|____
| | | | |
How many children does Robert have?
Jan
Figure in mono font
Paul
________________|__________________
| | | |
Tom Ann David Robert
_____|_____ ____|____ |
| | | | | ?
Jack Ann Don Sam Peter
___|___ ____|____
| | | | |
How many children does Robert have?
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