12. A number from 1-30 is chosen at random. What is the probability that the number is
not a prime number?

2/3

Step-by-step explanation:

let S be number of sample space

n(S)= 30

n(not prime number) =20

Pr(not prime number)=20/30

=2/3

the number of possible outcomes that do not show a 1 on the first spinner and show the number 4 on the second spinner is 2.

spinner 1 spinner 2

1                     1

1                     2

1                     3

1                     4

2                   1

2                   2

2                   3

2                   4   = not 1, and 4

3                   1

3                   2

3                   3

3                   4 = not 1, and 4

only 2 outcomes have passed the given condition.

step-by-step explanation:

just watch memes

step-by-step explanation:

it me < 3