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Question

If a+b+c=5 and ab+bc+ca=4 ,then the value of a2+b2+c2 is ______.
  1. 25
  2. 17
  3. 18
  4. 9


Solution

The correct option is B 17
a2+b2+c2=(a+b+c)22(ab+bc+ca) 
a2+b2+c2=(5)22(4)=258=17

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