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Question: Problem 1 (help me !!!)

Question:Problem 1 (help me !!!)

yangtheary 280 Maple
homework
March 30 2013
1

Mrs Bopha, used phone that had 7 numbers. Som didn't clear her phone number.Som remember 4 numbers in the first that had 9 ,8 , 7 and 7 Som didn't clear serial number 5 about 1 or 2.For serial number 6 didn't remember. But Som remember that serial number7 equal 5 minus serial number 6.How many time that Som  should be chose right phone 's number to Mrs Bopha?
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