Mathematics · Combinatorics
Find the value of the expression: (9C0 + 9C1 + ... + 9C9)[(9C0)2 + (9C1)2 + ... + (9C9)2]221(9C0 + 9C2 + ... + 9C8)
- 1440✓
- 250400
- 30
- 497240
Correct answer
440
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