How many such strings have exactly five as

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Reference no: EM132098889

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?

(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)?

Reference no: EM132098889

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