Question

ab-bc+ac+bc-ca+ab+ca-ab-2bc

Answer 1

the answer is ab + ac-2bc as all the other terms will get cancelled

Answer 2

Given,

ab-bc+ac+bc-ca+ab+ca-ab-2bc

So here is your answer,

ab+ab-ab-bc+bc+ac-ca+ca-2bc

= 2ab-ab+ac-2bc

= ab+ac-2bc

Hence. the answer is ab+ac-2bc