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    				| 1. | यदि a2 + b2 + c2 = 16 व ab+ bc + ca = 10, तब a + b + c का मान ज्ञात कीजिए। | 
| Answer» (a + b + c)2 = a2 + b2 + c2 + 2(ab + bc + ca) = 16 + 2 × 10 = 16 + 20 = 36 ∴ a + b + c = √36 = 6 | |