If you do all 50 questions correctly, you can get 50×2= 100 points.

If you don't answer 1 question, you will lose 2 points, and if you do a wrong question, you will lose 3 points.

Xiao Ming got 8 1, which is less than the total score 100-8 1= 19.

Because the unanswered questions are odd numbers, there are 1 unanswered questions, 1 missing 2 points, 19-2= 17 points, 17 points.

÷3=5.66, so it is impossible.

If you don't do three questions, subtract 6 points, and 19-6= 13, 13÷3=4.33.

So it's impossible

If you don't do five questions, you will lose 10, 19- 10=9, 9÷3=3, so you didn't do five questions and made three mistakes.