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27 May 2025, 04:09
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
95%
(hard)
Question Stats:
51% (01:59) correct
49%
(02:41)
wrong
based on 156
sessions
History
Date
Time
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Tabatha decorates the walls of her room by pasting 80 balloons, which include 20 red balloons. She randomly selects one balloon at a time and then pastes it on the wall. What is the probability that the third balloon she selects is a red balloon?
(A) 1/80
(B) 1/20
(C) 1/4
(D) 1/2
(E) None of the above
(A) 1/80
(B) 1/20
(C) 1/4
(D) 1/2
(E) None of the above
Praveena_10
29 May 2025, 20:45
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Probability of Selecting a red balloon= 20/80=1/4
Probability of selecting other colour balloon=60/80=3/4
Let X be other colour
There are 4 cases we can get for the above situation
RRR,RXR,XRR,XXR
Probability of selecting R in third balloon=1/4*1/4*1/4+1/4*3/4*1/4+3/4*1/4*1/4+3/4*3/4*1/4=16/64=1/4.
Probability of selecting other colour balloon=60/80=3/4
Let X be other colour
There are 4 cases we can get for the above situation
RRR,RXR,XRR,XXR
Probability of selecting R in third balloon=1/4*1/4*1/4+1/4*3/4*1/4+3/4*1/4*1/4+3/4*3/4*1/4=16/64=1/4.
General Discussion
29 May 2025, 21:36
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If she selects and paste it on the wall then how come the probability still remains 1/4 it should be 19/79 right ?
