Which of the following relation is true about mass of atom \( (m) \...

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Which of the following relation is true about mass of atom \( (m) \), molar mass \( (M) \) and Avogadro constant \( \left(N_{A}\right) \) ?
(a) \( M=\frac{m}{N_{A}} \)
(b) \( N_{A}=m M \)
(c) \( m=\frac{N_{A}}{M} \)
(d) \( m=\frac{M}{N_{A}} \)
\( \mathrm{P} \)
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