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Consider strings of length 70, in which each character is one of the letters a, b,...

Consider strings of length 70, in which each character is one of the letters a, b, c. please explain in detail.

1)How many such strings have exactly 1 letter c? please answer with detail.

2)How many such strings have exactly 12 letters c and exactly 30 letters b?

3)How many such strings have exactly 12 letters c or exactly 30 letters b?

4)How many such strings have at least 3 letters c

Math   Statistics-And-Probability   
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