30 Oct 2007 mark six

12,19,31,41,42,47,+13(extra number).
solution:
19-12=7.
42/7=6.
6x(41-31)=60.
60-47=13.(extra number).

27 Oct 2007 mark six

2,27,30,35,43,46,+36.(extra number).
solution:
43-35=8.
30-27=3.
(8-3)x2=10.
46-10=36.(extra number).

25 Oct 2007 mark six

4,14,31,35,42,49,+1(extra number).
solution:
14/(49-42)=2.
(35-31)/4=1.
2-1=1.(extra number).

23 Oct 2007 mark six

6,13,21,29,31,37,+25(extra number).
solution:
29-(37-31)-6+(21-13)=25.(extra number).

20 Oct 2007 mark six

4,14,18,19,30,42,+34(extra number).
solution:
(19-18)+14=15.
30/15=2.
42-(2x4)=34.(extra number).

18 Oct 2007 mark six

1,2,37,39,47,48,+34(extra number).
solution:
48/(47-37+2)=4.
39-4-1=34.(extra number).

16 Oct 2007 mark six

6,10,11,14,31,40,+49(extra number)
solution:
(31-11+10)/6=5.
40+14-5=49.(extra number).

13 Oct 2007 mark six

23,24,25,27,43,45,+11(extra number).
solution:
45-25=20.
43-27=16.
(23-20)+(24-16)=11.(extra number).

11Oct 2007 mark six

12,19,23,26,33,42,+27.(extra number).
solution:
26+(42-33)+(23-19)-12=27.(extra number)

09 Oct 2007 mark six

9,10,16,23,32,49,+19(extra number).
solution:
(16*10)/32=5.
5*9=45.
23-(49-45)=19.(extra number).

06 Oct 2007 mark six

7,20,25,33,38,45,+26(extra number).
solution:
(33-25)-(45-38)=1.
20+7-1=26.(extra number).

04 Oct 2007 mark six

6,14,28,29,37,38,+12(extra number).
solution:
14-(38-28)=4.
(37-29)/4=2.
6*2=12.(extra number).

02 Oct 2007 mark six

10,21,30,34,37,43,+17(extra number).
solution:
(43+37)/(30-10)=4.
34-21+4=17.(extra number).