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.


Statements: All fishes are grey in colour. Some fishes are heavy.


  1. All heavy fishes are grey in colour.
  2. All light fishes are not grey in colour.
Only conclusion I follows
Only conclusion II follows
Either I or II follows
Neither I nor II follows
Both I and II follow
Answer: Option
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.
39 comments Page 1 of 4.

Suraj said:   7 months ago
How is the answer A?

The premise nowhere says that all fishes are heavy.

Nidhi said:   3 years ago
The right answer is D.

Sneha priya said:   3 years ago
Here, the correct statement is "some heavy fishes are grey in colour".

Ayush said:   4 years ago
The correct answer is A according to Venn Diagram.

Diana said:   4 years ago
Based on both AEIO method and Venn diagram method, the correct answer is D.

Prashnath said:   4 years ago
Yes, the answer is correct. I agree with you bro @Bill. Whether it is heavy or light fish doesn't matter. In question only given all fishes are grey, hence A is correct.

Bonny salout said:   5 years ago
Can someone please explain this with a Venn diagram?

Bill said:   5 years ago
It has to be A.

If all fish are grey then how can a thing that isn't grey be a fish as they are all grey.

Somesh more said:   6 years ago
The answer to this question is d.

As conclusion 2 fails because there is nothing mentioned about light fishes.

And one fails because it is not mandatory that all heavy should be grey, if it was "some heavy are grey" then conclusion one would follow.

Tanveer said:   6 years ago
The correct answer is A. No, matter what a fish is (heavy or not), it's grey in colour.

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