Multiple Choice Questions

If a b c 12 and ab bc ca 8 then a2 b2 c2 is equal to ........

Quantitative Aptitude (CGL) Algebra

If a + b + c = 12 and ab + bc + ca = 8, then a² +b²+c² is equal to:

This questions was previously asked in

SSC CGL 11 June 2019 Shift-1

144

160

128

134

Correct option is 3:128

We know formula to calculate (a+b+c)² = a² + b²+ c² + 2ab + 2ac + 2bc

(12)² =( a² + b²+ c²) +2(ab+ac+bc)

144= ( a² + b²+ c²?)+ 2(8)

( a² + b²+ c²?) = 144-16= 128

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