You forget the last two digits of your password for a website.

65%

There are 100 possibilities for the last two digits  [ if we include 00].....therefore....you have  1/100 chance  [1 % ]  chance of choosing the correct one.....

Assuming that it is in fraction form, 1/676 . Also, I am assuming that it is the English alphabet, with 26 letters.

Work- 

\(\frac{1}{(26\times2)}=\frac{1}{676}\)

COMBINING two of the above answers      2 digits comprise   10 nemerals and 26 letters for each space  (36 possibilites for each space)   if you disallow special characters (!@#$%^&*   etc)

36 x 36 = 1296  possibilities     probability of guessing the correct last two digits  then becomes   1/1296

Question is unclear in that it does not say WHAT is allowed in the last two digits...numbers only?  Letters only?  Numbers AND letters only?   Special characters???    etc....

YMMV !    LOL