(1.2 x 105)2 + (3.11 x 1010) = ?

How do you use the elimination method for this question? explain, because i really want to understand!

Janice determined there were 10 possible outcomes when tossing two coins and spinning a spinner numbered 1 through 6. what is the correct number? what might have been janice's error?

Ineed here’s a picture of the question