Guest Posted April 20, 2008 Report Share Posted April 20, 2008 Using the numbers 1,5,6 and 7 once and only once make up 21 Quote Link to comment Share on other sites More sharing options...
0 Guest Posted April 20, 2008 Report Share Posted April 20, 2008 .5(6x7)^1 Quote Link to comment Share on other sites More sharing options...
0 Guest Posted April 20, 2008 Report Share Posted April 20, 2008 Using the numbers 1,5,6 and 7 once and only once make up 21 (7*6)/(SQRT(5-1)) SQRT -- for square root function Quote Link to comment Share on other sites More sharing options...
0 Guest Posted April 21, 2008 Report Share Posted April 21, 2008 not the answer i am looking 4 Quote Link to comment Share on other sites More sharing options...
0 Guest Posted April 21, 2008 Report Share Posted April 21, 2008 .5(6x7)^1 nope Quote Link to comment Share on other sites More sharing options...
0 Guest Posted April 21, 2008 Report Share Posted April 21, 2008 i think i got it.. tough one! .. 6/[1-(5/7)] = 6/0.285714.. = 21 Quote Link to comment Share on other sites More sharing options...
0 Guest Posted April 21, 2008 Report Share Posted April 21, 2008 not my answer Quote Link to comment Share on other sites More sharing options...
0 Guest Posted April 21, 2008 Report Share Posted April 21, 2008 not my answer so what are your rules for answering? just straight add/mult/subtract/divide? or can we use like 1 and 7 to make 17? or what about exponents? can you clarify a bit? Quote Link to comment Share on other sites More sharing options...
0 Guest Posted April 21, 2008 Report Share Posted April 21, 2008 yes it only uses 4 pairs of brackets and you can have a +, -, * or divide so it only uses those, but it might not use one of the +, -, * or divide in it. but nothing else is used Quote Link to comment Share on other sites More sharing options...
0 Guest Posted April 21, 2008 Report Share Posted April 21, 2008 Using the numbers 1,5,6 and 7 once and only once make up 21 I don't understand why you are rejecting the answers. If you have additional conditions it is better to state them ... otherwise it doesn't make sense to reject answers because they don't fit with the number on your brain. Edited: 4 typo Quote Link to comment Share on other sites More sharing options...
0 Guest Posted April 21, 2008 Report Share Posted April 21, 2008 there all right but not the 1 i have. Quote Link to comment Share on other sites More sharing options...
0 Guest Posted April 21, 2008 Report Share Posted April 21, 2008 hm.. perhaps if i rewrite mine to fit your "4 brackets" requirement? \frac{6}{1-\frac{5}{7}} =21 .. which is precisely the same as 6/{1-(5/7)} = 21 .. just different notation. Quote Link to comment Share on other sites More sharing options...
0 Guest Posted April 21, 2008 Report Share Posted April 21, 2008 yes Quote Link to comment Share on other sites More sharing options...
0 Guest Posted April 21, 2008 Report Share Posted April 21, 2008 yes i'm sorry to say that that makes me believe you didnt even understand your answer.. you should have recognized that my original solution was in fact right... but perhaps you are just unfamiliar with "/" as the symbol for division? i guess i'll give you be benefit of the doubt! heehee.. YAY! Quote Link to comment Share on other sites More sharing options...
0 Guest Posted April 21, 2008 Report Share Posted April 21, 2008 lol! your right i didnt know / was division but when i looked at my answer it had division sign instead so i thought it must be right so sorry about the fuss! Quote Link to comment Share on other sites More sharing options...
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Using the numbers 1,5,6 and 7 once and only once make up 21
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