A christmas string contains 15 lights 6 are damage you have

A christmas string contains 15 lights, 6 are damage, you have to replace them with 6 new lights but don't know which are the damage lights.

1. In how many combinations you can replace the 6 lights.

2. What is the probability that you replace all 6 damage lights.

3. In how many combinations you replace the 6 lights and 5 damage lights are still in the string.

4. In how many combinations you replace the 6 lights and the 6 damage lights are still in the string.

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A christmas string contains 15 lights 6 are damage you have : a christmas string contains 15 lights 6 are damage you have to replace them with 6 new lights but dont know which are

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