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Question 1:
Number n of license plates that can be made where each plate contains two distinct letters followed by three different digits is
A. 486000
B. 468000
Feedback n = 26 x 25 x 10 x 9 x 8 = 468000.
i.e. there are twenty-six choices for the first letter, but only twenty-five choices for the second letter which must be different from the first letter. Similarly, choices for the digits are 10, 9 and 8 since the digits must be distinct.
C. 498000
D. 489000

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Practice Permutations Online Test 6 | Englishfreetest.com