How to Solve the 9 Digit Number Puzzle?
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Furthermore, if the new number has the same number of digits we would expect a to be an even number. We can try a = 2. The new number has to be double the original number. So we have a kind of multiplication problem. The new number has 2 (2) = 4 as its last digit.
How many four digit numbers are not all the same?
The program, which was about 50 statements in Visual Basic, checked all of 8991 four digit numbers from 1000 to 9999 where the digits were not all the same. The table below shows the results: every four digit number where the digits aren’t all equal reaches 6174 under Kaprekar’s process, and in at most seven steps.
Which is the number of 2 digit numbers we can make?
Using the counting principle, the number of 2 digit numbers that we can make using 4 digits is given by 4 × 3 = 12. The above problem is that of arranging 2 digits out of 4 in a specific order. This is also called permutating. The most important idea in permutations is that order is important. When you use the digits 3 and 4 to make a number,
What are the possible numbers if the last digit is 4?
If the last digit is 4, the possible numbers are 404, 314, 224 and 134. If the last digit is 5, the possible numbers are 505, 415, 325, 235 and 145. Note the pattern here – If the last digit is 1, there is only one number.
Maya is a hardware enthusiast who tests and reviews smart home devices, smartphones, wearables, and audio gear. She focuses on practical consumer value and build quality.
