Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusions logically follow from the statements.
Statements:
Some balloons are nitrogen.
All balloons are hydrogen.
All hydrogens are helium.
Conclusions:
I. All balloons are helium
II. All nitrogens are heliums.
III. Some heliums are nitrogen.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. Only conclusions I and III follow.
The least possible venn diagram is:
Conclusions:
I. All balloons are helium → Follows (As all balloons are hydrogen and all hydrogens are helium. So, all balloons are also helium.)
II. All nitrogens are heliums. → Does not follow (It is possible but not definite)
III. Some heliums are nitrogen. → Follows (As some balloons are nitrogen, all balloons are hydrogen and all hydrogens are helium. So, some heliums are also nitrogen.)