The term "trial and error" is used when you plug in answers and determine which one works.
For example, you have the math problem: 3 x 14 = ?
Your answer choices are:
A. 51
B. 42
C. 28
D. 37
Instead of solving it on your own, you would plug in your answers to see which works. You would more commonly do this English and grammatical questions, but this is just an example.
I hope this was helpful :)
