Posted by **Juliette** on Thursday, December 18, 2008 at 5:17pm.

I have to find the probability of this event. heads on a coin and 5 on a 6 sided number cube, on one toss of a coin, and one roll of a number cube. Do I multiply the numbers 1/2 and 1/6, or add them? Thanks.

- Algebra -
**RED FIRE**, Thursday, December 18, 2008 at 5:23pm
You would multiply them to show the number of different combonations you can get for this event, but it would also show the probabilty.

- Algebra -
**Reiny**, Thursday, December 18, 2008 at 5:28pm
Generally, if the two events are mutually exclusive,

that is, one event has no effect on the outcome of the other,

then if you want the Prob(eventA AND eventB) you multiply them

if you want Prob(eventA OR eventB) you add them

so probability of 5 and heads would be 1/12

but

the probability of a 5 or heads would be

1/2 + 1/6 = 2/3

- Algebra -
**RED FIRE**, Thursday, December 18, 2008 at 5:30pm
reiny could you answer my chemistry lab question possibly?

- Algebra -
**Reiny**, Thursday, December 18, 2008 at 5:51pm
Sorry Redfire, the only thing I know about chemistry is that if I toss an Alka Selzer into a 7-Up bottle it causes quite a mess.

- Algebra -
**RED FIRE**, Thursday, December 18, 2008 at 5:54pm
lol that is fine

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