Can someone tell me what the hardest combinatorics/probability questions he knows is? im really bored dont hesitate just give me the hardest question you can think of.
The average price for gasoline rose from $2.85 to $3.24 in one day. Find the percent increase.
A school survey produced the following results. If about 300 students were surveyed, about how many have 4 or more pets at home?
+312 
