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Q.

The square root of a2 + b2 + c2 - 2ab - 2bc + 2ca is 

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a

a + b + c

b

a - b + c

c

a + b - c 

d

a - b - c 

answer is C.

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Detailed Solution

a2 + b2 + c2 - 2ab -2bc +2ca = a-b+c2 = a- b +c

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