Missing Digit Riddle

The centre of the third figure is empty. What digit should fit inside?

Missing Digit Riddle




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He called the five members of the crew whom he suspected and asked them what they were doing for the last 15 minutes.

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No Solution

In 2007, a puzzle was released and $2 million prizes were offered for the first complete solution. The competition ended at noon on 31 December 2010, with no solution being found. Wiki