A problem by Arul Kolla
What is the value of 1 0 0 0 − ( 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 1 0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 1 0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 1 0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 1 0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 1 0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 1 0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 1 0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 1 0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 1 0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 1 0 ) ?
The answer is 450.
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Putting the cursor over the L a T e X , we can see that there are ten rows of 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 1 0 s, so our answer is 5 5 × 1 0 , or 5 5 0 . 1 0 0 0 − 5 5 0 = 4 5 0 .