The sets of numbers in the box go together in a certain way. Find the set of numbers that

belongs where you see the question mark (?) in the box.
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I 246 247 248 I 247 843 742 246
I 842 ? 642 I
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The pattern 246, 247, 248 suggests that we are counting up by 1.

The pattern 247, 843, 742 suggests that we are alternating between adding and subtracting a larger number.

Therefore, to find the missing number, we start with 247 and add 596 to get 843. Then, we subtract 596 from 843 to get 247.

So, the missing number is 247.