Strings of four hexadecimal digits... 1) How many strings of four hexadecimal di

Question

Strings of four hexadecimal digits...

1) How many strings of four hexadecimal digits do not have any repeated digits?

2) How many strings of four hexadecimal digits have at least one repeated digit?

3) How many strings of four hexadecimal digits (including those in which not all the digits are distinct) are there?

4) What is the probability that a randomly chosen string of four hexadecimal digits has at least one repeated digit?

65,536

43,680

21,856

33.3%

66.7%

13.85%

21,840

50%

A.

65,536

B.

43,680

C.

21,856

D.

33.3%

E.

66.7%

F.

13.85%

G.

21,840

H.

50%

Explanation / Answer

1. B 2. C 3. A 4. E

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