Two statements are given followed by two conclusions I and II. You have to consider the two statements to be true even if they seem to be at variance from commonly known facts and then decide which of the given conclusion(s) logically follows/follow from the given statements.

Statements:

All buildings are chalks

No chalk is toffee.

Conclusions:

I. No building is toffee.

II. All chalks are building.

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  1. Both conclusions I and II follows
  2. Neither conclusions I and II follow.
  3. Only conclusion I follows.
  4. Only conclusion II follows.

Answer (Detailed Solution Below)

Option 3 : Only conclusion I follows.
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Detailed Solution

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The least possible Venn diagram for the given statements is as below:

F1 Rohit Ravi 02.09.21 D5

Conclusions: 

1. No building is toffee → True (As all the buildings are chalks and no chalks are toffee thus no building will toffee is a definite conclusion).

2. All chalks are building → False (It is possible but not definite).

Hence, the correct answer is "Only conclusion I follows".

Additional Information 

Suppose for an Example: All A are B.

F1 Pooja sharma 6.2.21 Pallavi D54

If we go from In to Out means from A to B then cases with All and some will be true like All A are B and Some A are B.

But if we go Out to In then only cases with Some will be true and All will be can't say like Some B are A will be true but All B are A will be can't say.

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