find the missing number in the last violet triangle.
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Correct answer is 14. 10 minus 3 = 7 multiplied by 2 = 14.
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It was easy, wasn't it? Also check this one: http://brainfans.com/brain-teaser/number-and-math-puzzle/22/number-in-a-triangle
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Number Puzzle Question
Which number is the result of the puzzle question on the picture? There are four letters and sixteen numbers. One number is correct.