10 A supermarket uses a five-digit number as a security code on its staff entrance. Digits may be repeated. How many different codes are possible when (i) any of the ten digits from 0 to 9 may be used, (ii) the zero cannot be used?
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- We need to find the number of possible five-digit security codes. - Digits may be repeated. - We have two scenarios: (i) any digit from 0 to 9 can be used, and (ii) zero cannot be used. Show more…
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