2222
9
There are only 999 three digit whole numbers.
There are 9 1-digit numbers and 16-2 digit numbers. So a 5 digit combination is obtained as:Five 1-digit numbers and no 2-digit numbers: 126 combinationsThree 1-digit numbers and one 2-digit number: 1344 combinationsOne 1-digit numbers and two 2-digit numbers: 1080 combinationsThat makes a total of 2550 combinations. This scheme does not differentiate between {13, 24, 5} and {1, 2, 3, 4, 5}. Adjusting for that would complicate the calculation considerably and reduce the number of combinations.
9
what is the least possible sum of two 4-digit numbers?what is the least possible sum of two 4-digit numbers?
40 and 43, among others.
There are five such numbers.
It is not clear what the question means: there are 31 2-digit numbers that can be expressed as a sum of two squares.
To find the even two-digit numbers where the sum of the digits is 5, we need to consider the possible combinations of digits. The digits that sum up to 5 are (1,4) and (2,3). For the numbers to be even, the units digit must be 4, so the possible numbers are 14 and 34. Therefore, there are 2 even two-digit numbers where the sum of the digits is 5.
The sum is 22 times the sum of the three digits.
Well, butter my biscuits! The two consecutive 4-digit numbers that add up to 9173 are 4586 and 4587. It's as simple as that, sugar!
2000.The smallest four-digit number there can be is 1000. So, add 1000 and 1000 to get 2000, then least sum you can get when adding two four-digit numbers.
Add the two greatest possible four digit numbers. 9999 + 9999
2,4,6,8,10,12,14,16,18
269
945