Multiple choice Simplify : b - [ b - ( a + b ) - b - { b - a + b ) } + 2a ] 4a 4b 2a 2b none of these Reveal answer Fill a bubble to check yourself A Correct answer Explanation b - {(a+b)-2a-(a+b)+b-2a}= b-{a+b-2a-a-b+b-2a}= b-{b-4a}= b-b+4a= 4a