How many such strings have exactly five as how many such


Consider strings of length 12 using symbols from ta, b, c, d

(a) How many such strings have exactly five a's?

(b) How many such strings have three of each letter?

(c) How many such strings have exactly five a 's and four b's?

(d) ow many such strings have exactly five a's or exactly four b's (remember that the word "or" is used in the inclusive sense)?

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Computer Engineering: How many such strings have exactly five as how many such
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