9 6 4 2
The figure above show an example of a 4-digit identification code used by a certain bank for its customers. If the digits in the code must appear in descending numerical order, not using zero and no digit can be used more than once, what is the difference between the largest and the smallest possible codes?
2007-10-10 03:51:51 · 7 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
9876-4321 = 5555
2007-10-10 03:56:26 · answer #1 · answered by ironduke8159 7 · 0⤊ 0⤋
2
2007-10-10 03:54:56 · answer #2 · answered by Anonymous · 0⤊ 1⤋
Four digits
Decending numerical order
No zeros
No repeats
largest: 9 8 7 6
smallest: 4 3 2 1
difference: 5 5 5 5
2007-10-10 04:07:58 · answer #3 · answered by mimi 3 · 0⤊ 0⤋
are you sure this is a so-called HARD question to you?the code must be a 4-digit number.so since no digit can be use more than once,the highest number is 9876.since not using zero,the smallest number is 4321.largest-smallest=9876-4321=5555.
why the smallest number cannot be 1234?since you cannot use zero,the smallest should be 1234.but remember,they want in descending order.so the smallest will be 4321.the final answer is 5555.
2007-10-10 03:59:34 · answer #4 · answered by dark 3 · 0⤊ 0⤋
The largest code is 9876
The smallest code is 4321
The difference is 5555
2007-10-10 03:55:57 · answer #5 · answered by Ivan D 5 · 1⤊ 0⤋
difference
=9876-4321
=5555
2007-10-11 07:25:48 · answer #6 · answered by Mugen is Strong 7 · 0⤊ 0⤋
huh?
2007-10-10 07:29:29 · answer #7 · answered by amir 2 · 0⤊ 0⤋