Logical Reasoning - Logical Deduction - Discussion
Discussion Forum : Logical Deduction - Section 1 (Q.No. 15)
Directions to Solve
In each question below are given two statements followed by two conclusions numbered I and II. You have to take the given two statements to be true even if they seem to be at variance from commonly known facts. Read the conclusion and then decide which of the given conclusions logically follows from the two given statements, disregarding commonly known facts.
Give answer:
- (A) If only conclusion I follows
- (B) If only conclusion II follows
- (C) If either I or II follows
- (D) If neither I nor II follows and
- (E) If both I and II follow.
15.
Statements: All fishes are grey in colour. Some fishes are heavy.
Conclusions:
- All heavy fishes are grey in colour.
- All light fishes are not grey in colour.
Answer: Option
Explanation:
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.
Discussion:
39 comments Page 2 of 4.
Kanwar said:
1 decade ago
The question has error as assumption 1 written in question doesn't match as that explained in explanation see carefully.
Ako venuh said:
1 decade ago
The conclusion cannot contain the middle term (fishes). And since one of the premises is particular the conclusion should be particular.
Trishul said:
1 decade ago
@Ako Venuh,
Fishes is the middle term but heavy fishes is not the middle term. Heavy fishes is a completely distributed subset of both fishes and heavy.
Fishes is the middle term but heavy fishes is not the middle term. Heavy fishes is a completely distributed subset of both fishes and heavy.
Rajesh Jha said:
1 decade ago
Answer should be D. Because to have a Universal positive conclusion we need to have both the sentences to be universal positive.
And the Rule of Either 1 or 2 also can not be applied as the subject and predicates are not same. Hence only D.
And the Rule of Either 1 or 2 also can not be applied as the subject and predicates are not same. Hence only D.
Sreeguru said:
10 years ago
Strongly would say its D.
Pooja said:
10 years ago
According to syllogism Answer must be D. Correct Answer should be "Some heavy fishes are grey in color".
Mona said:
10 years ago
According to Venn diagram A is correct.
Anshu ranjan said:
10 years ago
Middle word should not be there in conclusion. So answer is D and also one particular premise gives the particular conclusion and even if we converse the conclusion or by conversion of any other premises we don't able to get the required conclusion. So answer should be some heavy things are grey in color.
Sourav bibhor said:
9 years ago
Middle term should not come in the solution so it is invalid, answer should be particular affirmative should.
Raju said:
9 years ago
Even I think the answer is D. Can someone tell it in venn diagram method?
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