Question : Simplify the given expression: $b + 2a - [(3b + a) - (2a + b) + 2a] - a$
Option 1: $-a$
Option 2: $b$
Option 3: $-b$
Option 4: $a$
Correct Answer: $-b$
Solution : Given expression, $b + 2a - [(3b + a) - (2a + b) + 2a] - a$ $= b + 2a - [3b + a - 2a - b + 2a] - a$ $= b + 2a - a - 2b - a$ $= - b$ Hence, the correct answer is $-b$.
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