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19 Dec 2025, 07:25
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Bunuel
AD ---> nothing can be said about the no. of students enrolled in both course -Insufficient.
B --> Since all chemistry students are also enrolled in Biology, we know that at least one student is enrolled in both courses-- Sufficient.. Answer B
19 Dec 2025, 07:41
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(1)
If every student who is not enrolled in Biology is also not enrolled in Chemistry we can deduce that every student enrolled in Chemistry is also enrolled in Biology.
Chemistry has more than 25 students who are also enrolled in Biology.
Anwer is yes.
Condition (1) is sufficient
(2)
As in (1), the answer is yes.
Condition (2) is sufficient
The answer is D
If every student who is not enrolled in Biology is also not enrolled in Chemistry we can deduce that every student enrolled in Chemistry is also enrolled in Biology.
Chemistry has more than 25 students who are also enrolled in Biology.
Anwer is yes.
Condition (1) is sufficient
(2)
As in (1), the answer is yes.
Condition (2) is sufficient
The answer is D
19 Dec 2025, 07:42
Kudos
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We know that,
Biology has more than 25 students
Chemistry has more than 25 students
We need to know if there is atleast one student enrolled in biology and chemistry
Lets go through each statement 1 by 1,
Statement (1),
Every student who is not enrolled in biology is also not enrolled in chemistry
The contapositive statement also means that every student who is enrolled in chemistry is also enrolled in biology, and since chemistry has more than 25 students, then they are in biology too which answers our requirement
Statement (1) is sufficient
Statement(2),
Every student enrolled in chemistry is also enrolled in biology
Since we know chemistry has more than 25 students, then biology too will have more than 25 students.
This answers our requirement to see if there is atleast one student enrolled in both biology and chemistry class
Statement(2) is sufficient
D. Each statement alone is sufficient
Biology has more than 25 students
Chemistry has more than 25 students
We need to know if there is atleast one student enrolled in biology and chemistry
Lets go through each statement 1 by 1,
Statement (1),
Every student who is not enrolled in biology is also not enrolled in chemistry
The contapositive statement also means that every student who is enrolled in chemistry is also enrolled in biology, and since chemistry has more than 25 students, then they are in biology too which answers our requirement
Statement (1) is sufficient
Statement(2),
Every student enrolled in chemistry is also enrolled in biology
Since we know chemistry has more than 25 students, then biology too will have more than 25 students.
This answers our requirement to see if there is atleast one student enrolled in both biology and chemistry class
Statement(2) is sufficient
D. Each statement alone is sufficient
