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What is the digit $x$ is this cross-number?

Across Down

1. A cube 1. One less than a cube

3. A cube

If you liked this problem, here is an NRICH task that challenges you to use similar mathematical ideas.

If you liked this problem, here is an NRICH task that challenges you to use similar mathematical ideas.

*This problem is taken from the UKMT Mathematical Challenges.**View the archive of all weekly problems grouped by curriculum topic*

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