यदि (a + b + c) ≠ 0 और \(\frac{a}{(3a\space +\space b\space + \space c)}\) = \(\frac{b}{(a\space +\space 3b\space + \space c)}\) = \(\frac{c}{(a\space +\space b\space + \space 3c)}\) = 3x है, तो 5x ज्ञात कीजिए;

1
1 / 3 
2
1 / 15
3
 1 / 5
4
 1 / 10

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