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Posted: 8/31/2004 12:06:14 PM EST
[Last Edit: 8/31/2004 12:10:25 PM EST by Delmarksman]
My Daughter came home with a brain teaser today, it goes like this...

1 2 3 4 5 6 7 8 9

How many different ways can you come up with the #17, you can use any combination BUT you can only use the # once in each group (number sentance).

Good luck let's see what you can come up with.

Del
Link Posted: 8/31/2004 12:09:02 PM EST
[Last Edit: 8/31/2004 12:10:57 PM EST by EagleArmsHBAR]
Use number one and seven
Link Posted: 8/31/2004 12:10:09 PM EST
[Last Edit: 8/31/2004 12:11:32 PM EST by Sierra_Hombre]
1,146,484

1,146,485 ways
Link Posted: 8/31/2004 12:10:52 PM EST
Link Posted: 8/31/2004 12:17:25 PM EST
Need more information in the way of rules. What mathematical operations are allowed?
For example, square root of 9 times 3 plus 8 is 17. Are you talking about only using addition?
Link Posted: 8/31/2004 12:18:41 PM EST
[Last Edit: 8/31/2004 12:24:24 PM EST by Greenhorn]
1+9+7

2+8+1+6

3+9+5

3+4+­1+7+2

Screw it, too many.

Edited: Here's some good ones!

9.42+7.58

5(2 X 3) -8

The possibilities are endless.
Link Posted: 8/31/2004 12:18:55 PM EST
[Last Edit: 8/31/2004 12:19:21 PM EST by EagleArmsHBAR]
he never said add or subtract multiply or divide
so, th eanswer is one
1 2 3 4 5 6 7 8 9
Link Posted: 8/31/2004 12:37:34 PM EST

Originally Posted By EagleArmsHBAR:
he never said add or subtract multiply or divide
so, th eanswer is one
1 2 3 4 5 6 7 8 9



Yeah, but what fun is coming up with the lowest possible number of solutions?

Nobody has even started using exponents. 3 squared plus 8 is 17. So is 3 cubed minus 9 minus 1. For every simple equation that doesn't already contain the number one you can raise one of the numbers to the power of one and come up with another solution.
Link Posted: 8/31/2004 1:44:48 PM EST
Addition only sorry.
Link Posted: 8/31/2004 2:29:14 PM EST
8 + 9 = 17
1 + 7 + 9 = 17
2 + 6 + 9 = 17
3 + 5 + 9 = 17
1 + 2 + 5 + 9 = 17
1 + 3 + 4 + 9 = 17
2 + 7 + 8 = 17
3 + 6 + 8 = 17
1 + 2 + 6 + 8 = 17
4 + 5 + 8 = 17
1 + 3 + 5 + 8 = 17
4 + 6 + 7 = 17
1 + 3 + 6 + 7 = 17
1 + 4 + 5 + 7 = 17
2 + 3 + 5 + 7 = 17
2 + 4 + 5 + 6 = 17
1 + 2 + 3 + 5 + 6 = 17
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