Answer: 12 ways
Total number of ladder = 4
Yo can get to the platform either by climbing up the rope or fire mans hope
We have two options to get to the big platform
[tex]\begin{gathered} ^nP_r\text{ = }\frac{n!}{(n\text{ - r)!}} \\ ^4P_2\text{ = }\frac{4!}{(4\text{ - 2)!}} \\ =\text{ }\frac{4!}{2!} \\ \text{= }\frac{4\text{ x 3 x 2 x 1}}{2\text{ x 1}} \\ =\text{ 4 x 3} \\ \text{= 12 ways} \end{gathered}[/tex]