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three letter passwords are possible using the 26 letters in the English alphabet if (i) Repeats are not allowed and order matters? (ii) Repeats are not allowed and order does not matter? (ii) Repeats are allowed and order matters? (iv) Repeats are allowed and order does not matter? Exercise 2.3. How many 6 digit numbers (in base 10) have all of their digits in the set f8,9)?
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