I was wondering about a probability
What is the probability that If I tick answers randomly in a Multiple choice Test (say) with 5 choices in each question and 20 Questions - I will get all the answers right.
I can figure out that one. = 1 Correct set / 5^20 sets
But what about say "If I need to get (say) 40% (ie

answers right"
Yours Anxiously
Parag