RRB NTPC · Question 66
In the question below, two statements and some of their conclusions are given as alternatives. You have to follow both the given statements correctly, even if they seem to be at variance from commonly known facts. Read all the conclusions and then decide which of the given conclusions basically follows the given statements, regardless of the commonly known facts. Statements: 1. All stars are planets 2. All planets are moons Conclusion: 1. All moons are planets 2. Some planets are stars 3. Some moons are stars 4. All planets are stars A. Conclusions 1, 3 and 4 follow B. Conclusions 2 and 3 follow C. Conclusions 1, 2 and 3 follow D. All conclusions follow
Show answer & explanation
Answer: (B) B
Explanation
All stars are planets and all planets are moons. So some planets are stars (2) and some moons are stars (3). 'All moons are planets' (1) and 'all planets are stars' (4) reverse the statements. Only 2 and 3 follow.