12 (a + b + c)
12 (a - b - c)
12 (a - b + c)
12 (a + b - c)
Correct answer is A
12(a - b + c) + 12(a + b - c) - [12 (a - b - c)]
12a−12b+12c+12a+12b−12c−12a+12b+12c
= 12a+12b+12c
= 12(a+b+c)
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