please answer the third question crossed 1 part as fast as possible as it is very urgent

Dear Student, 


$Total number of Elements , n\left(S\right) = 25$
3(i) 
$$\begin{gathered} Total number of multiples of 3 from 1 to 25, n\left(E\right)= \left\{3,6,9,12,15,18,21,24\right\} = 8 \\ Probability = \frac{n\left(E\right)}{n\left(S\right)} = \frac{8}{25} \end{gathered}$$

3(ii ) 
$$\begin{gathered} Total number of multiples of 5 from 1 to 25, n\left(E\right)= \left\{5,10,15,20,25\right\} = 5 \\ Probability = \frac{n\left(E\right)}{n\left(S\right)} = \frac{5}{25} = \frac{1}{5} \end{gathered}$$

3(iii)
$$\begin{gathered} Total number of multiples of 3 and 5 from 1 to 25, n\left(E\right)= \left\{15\right\} = 1 \\ Probability = \frac{n\left(E\right)}{n\left(S\right)} = \frac{1}{25} \end{gathered}$$

3(iv)
$$\begin{gathered} Total number of multiples of 3 or 5 from 1 to 25, n\left(E\right)= \left\{3,5,6,9,10,12,15,18,20,21,24,25\right\} = 12 \\ Probability = \frac{n\left(E\right)}{n\left(S\right)} = \frac{12}{25} \end{gathered}$$

Regards,