railway RPF Constable Mock Test Series 2024 Quantitative Aptitude Algebra Identities

What is the value of a2 + 4b2 + 9c2 - 4ab + 12bc - 6ca? 

1
(a + 2b - 3c)2 
2
(2a - b - 3c)2 
3
(2b - a - 3c)2
4
(a - 2b - 3c)2
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