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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.

 Apr 10, 2017
 #1
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The average price for gasoline rose from $2.85 to $3.24 in one day. Find the percent increase.

 Apr 10, 2017
 #2
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A school survey produced the following results. If about 300 students were surveyed, about how many have 4 or more pets at home?
 

 Apr 10, 2017

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