Question: 5. If a student writes random strings of length 3 using the vowels (A,E,I,O,U) only, how many times is he required to write such strings

5. If a student writes random strings of length 3 using

5. If a student writes random strings of length 3 using the vowels (A,E,I,O,U) only, how many times is he required to write such strings to be sure that he has written a string twice

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