Teaching CTET (Paper 1 & Paper 2) Mock Test Series 2025 Quantitative Aptitude Algebra Identities

यदि ab + bc + ca = 8 और a2 + b2 + c2 = 20 है, तो 1/2 × (a + b + c)[(a – b)2 + (b – c)2 + (c – a)2] का संभावित मान है:

1
72
2
56
3
820
4
84
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