Answer:

Step-by-step explanation:
Probability refers to chance of happening of some event.
Conditional probability is the probability of an event A, given that another event B has already occurred.
denote the two boxes.
In box
:
No. of black balls = 1
No. of white balls = 1
In box
:
No. of black balls = 2
No. of white balls = 1
Let B, W denote black and white marble.
So, probability that either of the boxes
is chosen is 
Probability that a black ball is chosen from box
= 
Probability that a black ball is chosen from box 
To find:probability that the marble is black
Solution:
Probability that the marble is black = 
No 3,000 t-shirts are = to 12,840.
Answer:

Step-by-step explanation:

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Hope this helped!
<h2>~AnonymousHelper1807</h2>
You have the answer into the images.
Answer:$2
Step-by-step explanation:Express as two equations . Lex x Be chocolate and y be cookies.
3x+2y=22
2x+3y= 18
Common factor of 6 so times first ran by 2, second ran by 3 . Eliminate.