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a. 4
b. 5
c. 6
d. 7

2007-07-31 08:11:38 · 2 answers · asked by dave b 2 in Science & Mathematics Chemistry

2 answers

There are 6:
2,3
2,4
2,5
2,6
3,4
3,5

Count it out. If you aren't confident with the answer, you can confirm it using some math: permutations and combinations.

2007-07-31 14:35:55 · answer #1 · answered by Anonymous · 1 0

Definitely 7.

2007-07-31 15:23:18 · answer #2 · answered by Gervald F 7 · 0 0

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