Logical Deduction - Study Mode
[#91] Statements : Some swords are sharp. All swords are rusty. Conclusions : I. Some rusty things are sharp. II. Some rusty things are not sharp.
Correct Answer
(A) Only conclusion I follows
Explanation
Solution: Since one premise is particular, the conclusion must be particular and should not contain the middle term. So, I follows. Since both the premises are affirmative, the conclusion cannot be negative. Thus, II does not follow.
[#92] Statements : All fishes are grey in colour. Some fishes are heavy. Conclusions : I. All heavy fishes are grey in colour. II. All light fishes are not grey in colour.
Correct Answer
(A) Only conclusion I follows
Explanation
Solution: Since one premise is particular, the conclusion must be particular and should not contain the middle term. So, it follows that 'Some heavy things are grey in colour'. I is a cumulative result of this conclusion and the first premise. Thus, only I holds.
[#93] Statements : All good athletes win. All good athletes eat well. Conclusions : I. All those who eat well are good athletes. II. All those who win eat well.
Correct Answer
(D) Neither I nor II follows
Explanation
Solution: Since the middle term 'good athletes' is distributed twice in the premises, the conclusion must be particular and should not contain the middle term. So it follows that 'Some of those who win, eat well'.
[#94] Statements : All film stars are playback singers. All film directors are film stars. Conclusions : I. All film directors are playback singers. II. Some film stars are film directors.
Correct Answer
Only conclusion I follows
Explanation
Solution: Since both the premises are universal and affirmative, the conclusion must be universal affirmative and should not contain the middle term. So, I follows. II is the converse of the second premise and so it also holds.
[#95] Statements : All hill stations have a sun-set point. X is a hill station. Conclusions : I. X has a sun-set point. II. Places other than hill stations do not have sun-set points.
Correct Answer
(A) Only conclusion I follows
Explanation
Solution: Since both the premises are universal and affirmative, the conclusion must be universal affirmative and should not contain the middle term. So, only I follows.