1.

यदि `a=7, b=5` और `c=3` है तो `a^(2)+b^(2)+c^(2)-ab-bc-ca` का मान क्या होगा?A. 12B. `-12`C. 0D. 8

Answer» Correct Answer - A
`a^(2)+b^(2)+c^(2)-ab-bc-ca`
`=1/2[(a-b)^(2)+(b-c)^(2)+(c-a)^(2)]`
`=1/2[(7-5)^(2)+(5-3)^(2)+(3-7)^(2)]`
`=1/294+4+16)=24/2=12`


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