: A store has 15 cars of a certain brand. Among them, 7 are black, 6 are gray and 2 are white. Another store wishes to buy 3 cars of this brand, no matter what color. Let X be the number of sold black cars. Find the probability function of X?

Probability of function ' x ' is

Step-by-step explanation:

Store - 1

Total number of car = 15.

The number of

Black car = 7.

Grey car = 6.

White car = 2.

Store -2

The number of car wishes to buy = 3 car.

The number of black car sold = x .

The probability of 'x' = ?.

P ( x ) = P ( first black ) * P ( second black ) * P ( third is black )

P ( x ) =    =

So the probability of number of car sold is black or P ( x ) =

step-by-step explanation:

given that ab is divided into equal parts as

ac, cd, de, ef, fg, gh, hi, ib.

from this we find that f is the midpoint of ab.

so using mid point formula we find

f = (3,7)

similarly considering fb, we get

h = mid point of fb = ((6,6) and g, mid point of fh is

g = (9/2, 13/2)

i is mid point of hb

so i =(15/2,11/2)