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Find the missing number following the same relationship: 13 : 4 :: 19 : ? :: 16 : 5

1. 6
2. 2
3. 3
4. 5

Correct answer: 6

Solution

The rule is floor(n/3): floor(13/3)=4, floor(16/3)=5, floor(19/3)=6. So the missing number is 6.

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