Topic: 4 digits list of topics
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12 items are filed under this topic.

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	4-digit positive numbers		2010-02-15
		From marjon: Find the sum of all the 4-digit positive numbers with no zero digit. Answered by Penny Nom.
	A 4-digit phone code		2010-01-21
		From pat: my daughter can`t remember her 4-digit code to unlock her phone. she is pretty sure it starts with a 4. can you help us? my brain is locked up Answered by Robert Dawson.
	Combinations and permutations		2009-05-07
		From Renee: We are trying to figure out the equation or how to solve the problem of how many combinations of 4 digits you can get out of 0-9 without repeating the numbers in a set (i.e., no 0001, 0002) begining with 0123, 0124, 0125 etc Thanks! Answered by Stephen La Rocque.
	Four-digit combinations		2009-04-18
		From Carri: How many 4-digit combinations can be made out of digits 1, 2, 3, 4, & 5 using each number once? What are the combinations? Answered by Penny Nom.
	4 digit numbers from 1159		2009-03-10
		From David: I have the digits "1159" and need to come up with a complete list of possible four-digit combinations. It does NOT matter the order of the two number ones (1), so this will help eliminate many possibilities. Separately, it would also help to actually know the actual number of combinations with which I am dealing to start. David :) Answered by Penny Nom.
	Four digit numbers		2009-03-10
		From Theresa: I need to know the number of 4 digit numbers that can be formed using 1-2-3-4 without repeating numbers Answered by Penny Nom.
	4 digit strings starting with 7		2009-03-03
		From Angel: I need to no all the 4 digit combinations starting with 7 and with no repititions. Answered by Penny Nom.
	Four digit numbers using 1, 0, 2 and 8		2009-01-27
		From Mike: How many combinations of this four digit number 1028 can this produce only using those numbers. Example would be 0000, 0001,0002,0008,0010,0011,0012,0018,etc... Answered by Penny Nom.
	A four digit passcode		2009-01-12
		From john: i have a machine at home that has a four digit passcode and the numbers range from 1 to 4 how can i get all the ways those numbers can be used Answered by Harley Weston.
	A 4 digit passcode		2008-02-16
		From Rob: If there is a 4 digit passcode with only 6 punch in symbols, how many possibilities are there and what are they? symbols are: Y, X, RB, RT, LB, LT. Please get back to me, thanks for your time and help. Answered by Stephen La Rocque.
	Four digit palindromes		2003-05-05
		From Heather: How many palindromes were in between the numbers 1000 and 9999? Answered by Penny Nom.
	4 x abcd = dcba		2002-11-20
		From A student: Say you have a four digit number (e.g. abcd) and you multiply the number by 4. The answer you get will be the reverse order of the number you started with (dcba). What is the number? The four digits (a,b,c,d) cannot be the same number or cannot be repeated. Answered by Penny Nom and Claude Tardif.

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