If 1050 – 74 is written as an integer in base 10 notation, what is the sum of the digits in that integer?
424
433
440
449
467
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10^2有三位數
所以10^50有51位數
10^50-74後共有50位數
所以會是99......926
共有48個9再加2跟6
999...926
So it's 9*48+2+6=432+8=440