यदि a+b+c=13 , a^2+ b^2 + c^2 =69 हो तो ab +bc +ac क� – McqOptions

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1.	यदि a+b+c=13 , a^2+ b^2 + c^2 =69 हो तो ab +bc +ac का मान ज्ञात करे \|
A.	12
B.	50
C.	56
D.	67
Answer» C. 56

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