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what is the probablitty the fourth photograph will be of katie?

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2 Answers

Like Phillip said,
 
# of Photos of Katie = PK = 18
# of Photos of Robert = PR = 6
Total # of photos = 18 +6 = 24
 
After getting 3 photographs of Robert (24 -3),
 
PK = 18
PR = 3
TOTAL # of Photos remaining = 18 + 3 = 21 photos
 
=(18=number of photos of Katie)/(21=number of remaining photos) = 6/7 the answer is C.
Again, after removing 3 pictures of Robert, there are 21 photos remaining in the envelope, 3 of Robert and 18 of Katie.  The probability that the next photo will be of Katie is:
 
P = (Number of Photos of Katie Remaining) / (Total Number of Photos Remaining)
 
Remember to reduce the fraction. Let me know what you get!

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