Oh, what a happy little math problem we have here! Let's see, we can break down 3615 into four three-digit numbers by dividing it evenly. So, we have 904, 905, 903, and 903. Just like painting a beautiful landscape, sometimes all it takes is a little bit of patience and gentle calculation to find the right combination.
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There are 28706 such combinations. 5456 of these comprise three 2-digit numbers, 19008 comprise two 2-digit numbers and two 1-digit numbers, 4158 comprise one 2-digit number and four 1-digit numbers and 84 comprise six 1-digit numbers.
Well, friend, when you add two two-digit numbers together, the sum will always be a two-digit number or a three-digit number, not a four-digit number. It's like mixing different colors on your palette - you'll get a beautiful new shade, but it won't be something completely different. Just keep adding those numbers together and creating something wonderful!
The four smallest three digit composite numbers are: 100, 102, 104, 105 with sum 411.
300
Add the two greatest possible four digit numbers. 9999 + 9999