A warehouse is labeling computer inventory with 3-digit codes. Each code is to consist of four digits between the numbers 0 and 9. The manager is debating whether to allow any 3-digit codes to have leading zero's before a non-zero number is used. If not allowed, then numbers like0025cannot be used.
The manager wants to measure the magnitude of the number of 3-digit code possibilities that are lost if he disallows the use of leading zero's. How many such codes would be lost?
Choose the correct choice from the following:	A) 981	B) 1000	C) 1011	D) 1101	E) 100
The number of codes possible if leading zero is allowed = 10*10*10=10^3   The number of codes possible if leading zero is NOT allowed = 9*10*10*10=9*10^3   The difference = 10^3 - 9*10^2 = 10^2(10-9) = 10^2.   Answer: 100   Similar questions to practice:   Hope it helps.
<result>E</result>
A warehouse is labeling computer inventory with 3-digit codes. Each code is to consist of four digits between the numbers 0 and 9. The manager is debating whether to allow any 3-digit codes to have leading zero's before a non-zero number is used. If not allowed, then numbers like0025cannot be used.
The manager wants to measure the magnitude of the number of 3-digit code possibilities that are lost if he disallows the use of leading zero's. How many such codes would be lost?