# Monthly Archives: March 2018

# STEP I 2009 Q.4

# Siklos APCM Q.29

# STEP II 2009 Q.7

# STEP I-2012-13

Question: I choose at random an integer in the range 10000 to 99999, all choices being equally likely. Given that my choice does not contain the digits 0, 6, 7, 8 or 9, show that the expected number of different digits in my choice is 3.3616. Continue reading