the table below, make one selection in each column.
where you have to select one option in each column. you have to make correct selections in both columns to get credit for the problem.
there are five options in the first column, so your chances to get the right answer there are 1/5.
there are five options in the second column, so your chances to get the right answer there are 1/5.
that's not much of a chance. so yes, in some cases, you might have to make a low-probability guess like this, but you are well advised to manage your time so that it won't be necessary. check out this post that deals 