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number puzzles [mathematical operations] [3]

number puzzles [10] [mathematical operations] [3]
[News Flash]
Within the 3 x 3 grid there are 4 opposite sets of numbers [5 - 11] [4 - 9] [8 - 17] [7 - 15]. What mathematical operation can you type into the middle frame [?] which will connect ALL of the numbers? To start the sequence again just refresh the page.