Ramsey Posted March 16, 2011 Report Share Posted March 16, 2011 michelle dropped her iphone and the screen cracked. she can no longer read the last four digits of anyones number. the last 4 digits of caseys phone number could include 1,2,5,6,8, or 9. if michelle knows that the first digit is NOT 5, the last digit is odd and no digits are repeated, what are the maximum # of phone calls michelle would have to make to call casey. at first i thought 156 but im thinking its 120 Quote Link to comment Share on other sites More sharing options...
evan9381 Posted March 16, 2011 Report Share Posted March 16, 2011 call paul to get replacement iphone and tell her to quit being cheap and guessing her friends number? Quote Link to comment Share on other sites More sharing options...
Furloaf Posted March 16, 2011 Report Share Posted March 16, 2011 I think 156 too. Why did you reconsider to 120? Quote Link to comment Share on other sites More sharing options...
Ramsey Posted March 16, 2011 Author Report Share Posted March 16, 2011 I think 156 too. Why did you reconsider to 120? it is from another forum and he said its multiple choice and 156 is not an option. i was thinking it was a simple as 5*4*3*2 Quote Link to comment Share on other sites More sharing options...
Furloaf Posted March 16, 2011 Report Share Posted March 16, 2011 I figured it by looking at the last number combinations: If it is 1, there are 48 permuations. 5, 60 and 9, 48. 48+60+48 = 156 Quote Link to comment Share on other sites More sharing options...
ej20_ftw Posted March 16, 2011 Report Share Posted March 16, 2011 200? Quote Link to comment Share on other sites More sharing options...
99FLHRCI Posted March 16, 2011 Report Share Posted March 16, 2011 I figured it by looking at the last number combinations: If it is 1, there are 48 permuations. 5, 60 and 9, 48. 48+60+48 = 156 This. If 156 is not an option I would question if the problem was copied correctly. Quote Link to comment Share on other sites More sharing options...
unfunnyryan Posted March 16, 2011 Report Share Posted March 16, 2011 call paul to get replacement iphone and tell her to quit being cheap and guessing her friends number? i lol'd Quote Link to comment Share on other sites More sharing options...
verse Posted March 16, 2011 Report Share Posted March 16, 2011 I figured it by looking at the last number combinations: If it is 1, there are 48 permuations. 5, 60 and 9, 48. 48+60+48 = 156 There are 48 different inputs for each last number, there are only 3 numbers that could be last. 48+48+48 = 144 Quote Link to comment Share on other sites More sharing options...
99FLHRCI Posted March 16, 2011 Report Share Posted March 16, 2011 There are 48 different inputs for each last number, there are only 3 numbers that could be last. 48+48+48 = 144 If you use 5 for the last number there are 60 options for the first 3. If you use 1 or 9 there are 48 options for the first 3. Hence the 48+60+48=156 Quote Link to comment Share on other sites More sharing options...
CRed05 Posted March 16, 2011 Report Share Posted March 16, 2011 So it can only end in 1, 5 or 9. 48 possible combinations for each one. 48*3 = 144. edit: aaah fuck i guess ending in 5 has 60 combinations... Quote Link to comment Share on other sites More sharing options...
Ramsey Posted March 16, 2011 Author Report Share Posted March 16, 2011 It has to be 156....... Im gonna set the other forum on fire. Quote Link to comment Share on other sites More sharing options...
99FLHRCI Posted March 16, 2011 Report Share Posted March 16, 2011 What are the multiple choice options? Quote Link to comment Share on other sites More sharing options...
Ramsey Posted March 16, 2011 Author Report Share Posted March 16, 2011 120 144 288 360 Quote Link to comment Share on other sites More sharing options...
99FLHRCI Posted March 16, 2011 Report Share Posted March 16, 2011 I would guess the answer would be B)144 and they made an error when they wrote/solved the problem. Quote Link to comment Share on other sites More sharing options...
Furloaf Posted March 22, 2011 Report Share Posted March 22, 2011 Any update on the answer? Quote Link to comment Share on other sites More sharing options...
Buck531 Posted March 22, 2011 Report Share Posted March 22, 2011 Michelle needs to buy a new fucking phone! Problem solved. 1 Quote Link to comment Share on other sites More sharing options...
Ramsey Posted March 22, 2011 Author Report Share Posted March 22, 2011 Any update on the answer? we are assuming error in answers Quote Link to comment Share on other sites More sharing options...
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