Task: Question Answering
Input (English): Problem: a contest will consist of n questions , each of which is to be answered eithertrueorfalse . anyone who answers all n questions correctly will be a winner . what is the least value of n for which the probability is less than 1 / 10 that a person who randomly guesses the answer to each question will be a winner ? 
Options: a ) 5 , b ) 10 , c ) 50 , d ) 100 , e ) 1000
Output (English): d