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09 Jul 2026, 05:41
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imo D
Since in 1 its given that p(m')<0.45 so P+R<0.45 so r cannot be greater than 5/8=0.625 sufficient
in 2 P(r')>0.4 p+m>0.4 p+m+r=1 so 1-r>0.4 r<0.6 sufficient that its <0.625
Since in 1 its given that p(m')<0.45 so P+R<0.45 so r cannot be greater than 5/8=0.625 sufficient
in 2 P(r')>0.4 p+m>0.4 p+m+r=1 so 1-r>0.4 r<0.6 sufficient that its <0.625
Sakshi1405
GMAT Focus 1: 645 Q87 V82 DI77 
Posts: 35
09 Jul 2026, 05:42
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Each participant is assigned to exactly one group and we are to find the probability of a randomly selected participant is in reception group greater that 5/8 i.e 62.5%
Now,
statement 1 - P (not in material group) < 45%
So if not material group then either planning or reception or both is less than 45%
So probability > 62.5% No --> Sufficient
statement 2 - P (not in reception group) > 40%
So in reception group would be <= 40% so again No --> Sufficient
Option D
Now,
statement 1 - P (not in material group) < 45%
So if not material group then either planning or reception or both is less than 45%
So probability > 62.5% No --> Sufficient
statement 2 - P (not in reception group) > 40%
So in reception group would be <= 40% so again No --> Sufficient
Option D
Bunuel
09 Jul 2026, 05:45
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P = planning
R = reception
M = materials
p(R) > 5/8 = 62.5% ?
p(P) + p(R) + p(M) = 100%
(1)
p(not M) = p(P) + p(R) < 45%
If p(P) + p(R) < 45% then p(R) < 45% and p(R) is not greater than 62.5%.
The answer is no.
Sufficient
(2)
p(not R) = p(P) + p(M) > 40%
As p(P) + p(R) + p(M) = 100% then p(R) < 60% that is not greater than 62.5%.
The answer is no.
Sufficient
IMO D
R = reception
M = materials
p(R) > 5/8 = 62.5% ?
p(P) + p(R) + p(M) = 100%
(1)
p(not M) = p(P) + p(R) < 45%
If p(P) + p(R) < 45% then p(R) < 45% and p(R) is not greater than 62.5%.
The answer is no.
Sufficient
(2)
p(not R) = p(P) + p(M) > 40%
As p(P) + p(R) + p(M) = 100% then p(R) < 60% that is not greater than 62.5%.
The answer is no.
Sufficient
IMO D
