4. In a certain African country, vehicle license plates consist of two letters of the alpha-
bet, followed by four digits from 0 to 9, 0 and 9 included.
(a). How many different license plates are there if the second letter on the plate is either
an ’O’ or a ’Q’ and the last digit is either a 3 or an 8?
(b). How many license plates are there if the first letter must be a ’K’ and the second
letter must be an ’A’ and the last digit must be 5?
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Answer:
The force, which opposes the relative motion between two surfaces in contact is known as friction.
Step-by-step explanation:
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