Evaluate: 1850 - [450 - {210 - (100 - 60 - 7)}]
1577
First, solve the inner parentheses: 100 - 60 - 7 = 33. Now, evaluate the next set: 210 - 33 = 177. Then, 450 - 177 = 273. Finally, 1850 - 273 = 1577. Thus, the correct answer is Option 4.
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