यदि $a+b+c=1$ और $ab+bc+ca=\frac{1}{3}$ है,तो $a:b:c$ क्या है?

  • A
    $1:2:2$
  • B
    $2:1:2$
  • C
    $1:1:1$
  • D
    $1:2:1$

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