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Three digits and the bigger digit

How many numbers of three digits distinct and different from zero there, such that the digit of tens is bigger than the other?

Note by Lucas Nascimento
1 year, 2 months ago

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1 vote

  Easy Math Editor

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    # up as a code block.

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Remember to wrap math in \( ... \) or \[ ... \] to ensure proper formatting.
2 \times 3 \( 2 \times 3 \)
2^{34} \( 2^{34} \)
a_{i-1} \( a_{i-1} \)
\frac{2}{3} \( \frac{2}{3} \)
\sqrt{2} \( \sqrt{2} \)
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\sin \theta \( \sin \theta \)
\boxed{123} \( \boxed{123} \)

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