21 Card Trick: improvement

[anishnath]

Tool: 21 Card Trick
URL:

Proposal

Include real-world example problems with solutions. (https://8gwifi.org/21-card-trick.jsp)

Why

Enhances accuracy and usability for math learners and practitioners.

Acceptance Criteria

• Clear handling of edge cases covered in tests/docs
• Example inputs/outputs included in the page
• Mobile/desktop layout verified
• Accessibility (labels/aria) checked