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Three combinations. Reduce 4000/5000/45000 to 4/5/45 to make it easier to illustrate.

1) Basic combination: 9x5=45 or (4+5)x5=45 So 5 each of 4 and 5 as below

4+4+4+4+4 + 5+5+5+5+5 = 45

2) Replace 5 4's with 4 5's as below

5+5+5+5 + 5+5+5+5+5 = 45

3) Instead, replace 4 5's with 5 4's as below

4+4+4+4+4 + 5 + 4+4+4+4+4 = 45

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Q: How many combinations are there with 4000 and 5000 till the total comes to 45000?
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