Question

Question 15 of 43

A bag of marbles has 12 red, 7 yellow, 5 blue and 1 white. Find the probability
of selecting 4 marbles from the bag where all 4 are red.
9
A.
o
B.
1
C.
75900
o
D.

Answer 1

Option A

Explanation:

`(12)/(25) * (11)/(24) * (10)/(23) * (9)/(22)`

we start with 12 red marbles out of 25 marbles, that's the probability for the first.

in the second step we have one red marble less, wich also means one marble less overall

and so on

`(12 * 11 * 10 * 9)/(25 * 24 * 23 * 22)`

`= (11880)/(303600)`

can be reduced by 1320 (step by step) to

`(9)/(230)`