a - [b - {c-(a-b-c)}] = ?
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what is the question I don't know
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Step-by-step explanation:
Given that, = a - [ b - { c - ( a - b - c ) } ]
= a - [ b - { c - a + b + c } ] (∵ - × + = - ; - × - = + )
= a - [ b - { - a + b + 2c } ]
= a - [ b + a - b - 2c ] ( ∵ - × -= + ; - × + = - )
= a - [ a - 2c ]
= a - a + 2c ( ∵ - × + = - ; - × - = + )
= 2c is the answer.
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