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Question 18 of 20

Answer: 17

First, find a pattern in the grid that repeats. The only repeating pattern on this grid that eventually uses all the numbers is 2 numbers on a horizontal row, with another number between them on the row below.

Looking at this pattern, we can see that the bottom number is the sum of the DIGITS of the two numbers above.

The missing number will therefore be 1 + 3 + 4 + 9 = 17.

The pattern would then continue:

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