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January 28, 2015

January 28, 2015

Posted by **holly** on Wednesday, March 3, 2010 at 6:12pm.

- math -
**PsyDAG**, Wednesday, March 3, 2010 at 6:53pmHere are the possible ways to sum 9 with 2 cards.

8 + 1

7 + 2

6 + 3

5 + 4

1 + 8

2 + 7

3 + 6

4 + 5

Each pair has the probability of (1/10)^2. The probability of either-or events is determined by the sum of the individual events.

I hope this helps.

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