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
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