probability question

crucifiedx SG · 2010-09-20T16:37:11+00:00

for example, r 3/4 / r 3/4 / P 1/4 \ nr 1/4 \ ...

1. and

2. or

which one must multiply and which one must add?

and is X

or is +

1. and

2. or

which one must multiply and which one must add?

I dont get wad u meant.

thanks. :)

for example,

3/4 /

1/4 \

...both days will rain. r x r

=3/4 x 3/4

=9/16 (and)

...either one day will rain. (r x nr) + (r x nr)

=(3/4 x 1/4) + (3/4 x 1/4)

=3/8(or)

u understand?