Given data:
The total numbers of marbles are n=10.
The expression for the probability of drawing 2 pink marbles one by one without replacement is,
[tex]\begin{gathered} P(2p)=\frac{3}{10}\times\frac{2}{9} \\ =\frac{1}{15} \end{gathered}[/tex]Thus, the probability of drawing 2 pink marbles one by one without replacement is 1/15.