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   6 0 k 3 k 51 C is equal to

1. 52 C 3 – 45 C 3
2. 52 C 4 – 45 C 4
3. 51 C 3 – 45 C 3
4. 51 C 4 – 45 C 4

Correct answer: 52 C 4 – 45 C 4

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