SSC SSC GD Constable 2025 Mock Test Series Quantitative Aptitude Algebra Identities

a + b + c = 0 এবং a2 + b2 + c2 = 40 হলে, 4ab + 4bc + 4ca এর মান কত?

1
-80
2
-40
3
-20
4
-160
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