To find the total length of ribbon needed to tie the three parcels, we can multiply the length of ribbon required for each parcel by the number of parcels:
\[ \text{Total length needed} = \text{length per parcel} \times \text{number of parcels} = 45, \text{cm} \times 3 = 135, \text{cm} \]
Now, we compare the length of the ribbon we have to the length needed:
Given: \[ \text{Length of ribbon we have} = 2, \text{cm} \]
Since 2 cm is less than 135 cm, we will have no ribbon left after attempting to tie the parcels.
Therefore, the length of ribbon left is:
\[ \text{Length of ribbon left} = 2, \text{cm} - 135, \text{cm} = -133, \text{cm} \]
This indicates that we will need an additional 133 cm of ribbon to tie the three parcels, and there will be no ribbon left after using what we have.
In conclusion, there will be no ribbon left as 2 cm is insufficient to tie the parcels.