Question

I don't get this crap whats wrong with my school assignment questions

Answer 1

http://gyazo.com/a336c95c9b94a8daca65183398e194cc

Answer 2

@hartnn

Answer 3

@asnaseer

Answer 4

@freckles

Answer 5

do you know what the union operator does?

Answer 6

it means to take elements from both the sets ?

Answer 7

yeah. so when you have 1 union 2, it means {1, 2}.
so the first thing is asking what is the probability that you will get either 1 OR 2 if you roll the die with sides 1, 2, 5, 5, 6, 6.

Answer 8

the basic probability formula is
$$P = \frac{number\thinspace of\thinspace desirable\thinspace outcomes}{number\thinspace of\thinspace total\thinspace outcomes}$$

Answer 9

the probability would be 1/3
look at freaking options

Answer 10

in this case there are 2 unique desirable outcomes out of 6 total outcomes

Answer 11

so ya, it's 1/3.

Answer 12

what about P(5 U 6) ?

Answer 13

count how many 5's or 6's are possible. divide by total number of choices (6)
simplify the ratio

Answer 14

that gives 1/3 too and P(2 U 5 U 6) gives 1/2 which doesn't even exist in the table

Answer 15

notice 2 of the 6 sides have a 5 on them
2 of the 6 sides have a 6
how many sides have a 5 or a 6 ?

Answer 16

do you get the idea ?
For example, if *all* 6 sides had a 5. you would a chance of getting a 5 of : 6 sides / 6 sides= 1 (which should make sense... 100% chance yo get a 5)

if you had 3 of the sides with a 5, you would get a chance of 3/6= 1/2

in the case of P( 5 U 6)
count how many sides have a 5 or 6 on them. How many ?
then divide by 6

Answer 17

1,2,5,5,6,6
means the die has those numbers on its 6 sides: a "1", a side with a "2", two sides with "5" and two sides with "6"

Answer 18

I get it thanks !