Ever think you have so much good luck that you could guess on a multiple choice test and achieve a perfect score? Well, think again.  If the test consists of 10 questions with 4 choices for each question, there are

4 ∙ 4 ∙ 4 ∙ 4 ∙ 4 ∙ 4 ∙ 4 ∙ 4 ∙ 4 ∙ 4 = 4¹⁰ = 1,048,576 ways to answer the 10 multiple choice questions. 

If each question has only 1 correct answer and you guess on every one, you have a 1 in 1,048,576 chance of getting a perfect score..

Better start studying!!