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Find the missing number: 9 : 90 :: 15 : 240 :: 3 : ?

1. 8
2. 6
3. 12
4. 2

Correct answer: 6

Solution

The pattern is n x (n+1): 12 x 11 = 132; 20 x 19 = 380; 2 x 3 = 6. The missing number is 6.

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