bonanova Posted October 5, 2008 Report Share Posted October 5, 2008 Here are three number strings: 5 8 2 7 4 9 9 4 7 8 5 5 8 7 9 which string comes next? 7 8 5 8 7 9 9 8 5 9 7 8 Quote Link to comment Share on other sites More sharing options...
0 Guest Posted October 5, 2008 Report Share Posted October 5, 2008 Here are three number strings: 5 8 2 7 4 9 9 4 7 8 5 5 8 7 9 which string comes next? 7 8 5 8 7 9 9 8 5 9 7 8 9 8 5 The left hand digit alternates 9 and 5, and so does the right Quote Link to comment Share on other sites More sharing options...
0 Guest Posted October 5, 2008 Report Share Posted October 5, 2008 4. 9 7 8 It looks like the string is being reversed each time, and the 4th digit removed. So reversing it would give you 9 7 8 5 and then remove the 5. Quote Link to comment Share on other sites More sharing options...
0 bonanova Posted October 5, 2008 Author Report Share Posted October 5, 2008 Bingo. I removed the lowest digit each time, but that turns out to the the 4th digit after reversal. Quote Link to comment Share on other sites More sharing options...
0 Guest Posted October 5, 2008 Report Share Posted October 5, 2008 9 7 8 Everytime the string is inverted and 4th last digit is omitted Quote Link to comment Share on other sites More sharing options...
0 Guest Posted October 5, 2008 Report Share Posted October 5, 2008 Here are three number strings: 5 8 2 7 4 9 9 4 7 8 5 5 8 7 9 which string comes next? 7 8 5 8 7 9 9 8 5 9 7 8 Can I have a different answer? Every time you revert the numbers, you remove the digit, is so happen to be the number which is 2^(n-1), where n is the row number. Line 2, you removed 2 ( 2^1 = 2) line 3, you removed 4 (2^2 = 4) so I though line 4 should remove 8 (2^3 = 8) then my answer become 975, which is not in the list of choices. sorry, not try to be different, just point out the coincidence I found. Quote Link to comment Share on other sites More sharing options...
0 Guest Posted October 6, 2008 Report Share Posted October 6, 2008 thats easy.4. unless you want to get more complicated and find a different answer. Quote Link to comment Share on other sites More sharing options...
Question
bonanova
5 8 2 7 4 9
9 4 7 8 5
5 8 7 9
which string comes next?
7 8 5
8 7 9
9 8 5
9 7 8
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