To have a sum, you must have two or more numbers to addtogether. Unless you want the sum of the digits of 998, which is 9+9+8=26.
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It is: 998*180 = 179640 degrees
19, 998.
998
Suppose the sum is SS = 100 + 101 + ... + 998 + 999 Also, writing it in reverse order gives S = 999 + 998 + ... + 101 + 100 so, adding the two together, 2S = 1099 + 1099 + ... + 1099 + 1099 where there are 900 such terms. So S = 1099*900/2 = 494550.
The answer is 998.