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Identify the value that replaces the question mark following the same pattern: 5 : 15 :: 11 : 99 :: 4 : ?

1. 8
2. 12
3. 24
4. 20

Correct answer: 8

Solution

The pattern is n x (n-2). For 7: 7x5=35; for 21: 21x19=399; for 4: 4x2=8. So the missing term is 8.

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