[計量] 請教一題CAT Test 4
If 10^50-74 is written as an integer in base 10 notation,
what is the sum of the digits in that integer?
A. 424
B. 433
C. 440
D. 458
E. 467
答案是440,
但我算的答案是458, 我的算法是:
48*9+26=432+26=458
應該是有48個9不是嗎?
麻煩版上強者了,謝謝。
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