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631
Prove by tony123

0  671  20080605 21:37:21 by tony123 
632
Determine the number by tony123

1  707  20080605 16:48:52 by JohnnyReinB 
633
Assume xyz=8. Prove that by tony123

1  723  20080605 08:54:40 by JaneFairfax 
634
Solve the following equation by tony123

1  700  20080602 01:01:07 by mathsyperson 
635
For which by tony123

1  703  20080531 01:29:43 by mathsyperson 
636
Two men by tony123

1  1,025  20080530 22:07:07 by JaneFairfax 
637
Google US Puzzle Championship by Kurre

0  764  20080529 05:46:26 by Kurre 
638
Beyond Monty Hall by MathsIsFun

8  2,372  20080528 04:57:47 by TheDude 
639
Relaxing game by Identity

0  707  20080527 00:43:28 by Identity 
640
Sticks! by JaneFairfax

9  3,052  20080520 22:39:33 by mathsyperson 
641
Two inequalities by Kurre

0  674  20080519 06:11:04 by Kurre 
642 
58  14,957  20080511 22:12:57 by JohnnyReinB 
643
The economist, the logician, and the mathematician by JaneFairfax

2  1,585  20080511 06:19:24 by JaneFairfax 
644
Guess my name! by jU

1  988  20080510 15:22:43 by John E. Franklin 
645
Dragon Boat by Identity

2  1,056  20080507 22:01:15 by Identity 
646
Plinx by JaneFairfax

6  1,736  20080507 12:16:33 by JaneFairfax 
647
Jenny by tony123

5  1,719  20080429 15:06:55 by integer 
648 
37  8,925  20080425 21:59:59 by landof+ 
649 
3  2,135  20080424 20:21:21 by Chocó 
650
2,4,8, what... by bossk171

14  3,697  20080415 03:12:18 by Kurre 
651
Peter Grabarchuk's Puzzle Book by MathsIsFun

3  1,579  20080411 09:49:28 by MathsIsFun 
652 
33  16,421  20080410 12:58:36 by 0001101 
653
Pentomino by Odette

0  900  20080401 20:56:52 by Odette 
654 
42  13,761  20080331 23:54:45 by lightning 
655
Inequality! Yay! by Identity

2  1,250  20080330 22:52:58 by Identity 
656
Find the smallest positive by tony123

1  904  20080326 06:07:52 by JaneFairfax 
657
Canoe Solve This? by Chocó

2  1,816  20080321 02:41:05 by mathsyperson 
658
ten numbers by tony123

2  1,003  20080319 01:05:33 by JaneFairfax 
659
prove that by tony123

1  937  20080317 22:43:08 by JaneFairfax 
660
Silly Dots by John E. Franklin

8  1,970  20080317 16:54:48 by John E. Franklin 