Number in a triangle
What number fits into the last triangle (maths puzzle)
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use some basic mathematical operations applied to the three numbers in the corner of a triangle
5. Top number multiplied by lower left number subtracted by the lower right one.
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Awesome. It took me some time but solved this puzzle. Five points.
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There are five number series puzzles on the picture. Each series continues with some number (replace the question mark with your number).