SOLUTION: A five character password consists of one letter from the word HELP, followed by four digits which may be 1, 2, 3, 4. If the digits may be used more than once, how many more passwo
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-> SOLUTION: A five character password consists of one letter from the word HELP, followed by four digits which may be 1, 2, 3, 4. If the digits may be used more than once, how many more passwo
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Question 362370: A five character password consists of one letter from the word HELP, followed by four digits which may be 1, 2, 3, 4. If the digits may be used more than once, how many more passwords can be made than if the numbers are used only once? Answer by sudhanshu_kmr(1152) (Show Source):
case 1: if numbers are used only once.
no. of ways to arrange last four digit = 4!
total no. of password possible = 4 * 4! = 96
case 2: if numbers can be repeated
no. of ways to arrange last four digit= 4^4 = 256
total no. of password possible = 4* 256 = 1024
so, (1024 - 96 ) = 928 more passwords possible.....
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