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Mini Cross-number

Stage: 3 and 4 Short Challenge Level: Challenge Level:1

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

Across                  Down
1. A cube              1. One less than a cube
3. A cube              2. A number

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.
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