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Question

Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusions logically follow(s) from the statements.

Statements:
All pins are bugs.
All pins are cows.

Conclusions:
(I): Some bugs are cows.
(II): All cows are pins.

This question was previously asked in
RRB NTPC 2024 CBT 1 Question Paper (28-Aug-2025) (Shift 3)
The correct answer is
Only conclusion (I) follows.

Logical Deduction: Pins, Bugs, and Cows

This problem requires analyzing logical statements to determine which conclusions are valid.

Analyzing the Statements

We are given two statements:

  • Statement 1: All pins are bugs.
  • Statement 2: All pins are cows.

Let P represent the set of 'pins', B represent the set of 'bugs', and C represent the set of 'cows'. The statements can be written in terms of set theory:

  • $P \subseteq B$ (All pins are bugs)
  • $P \subseteq C$ (All pins are cows)

Evaluating Conclusion (I): Some bugs are cows

Since the set of pins (P) is a subset of both the set of bugs (B) and the set of cows (C), it means that any item that is a pin is necessarily both a bug and a cow.

This implies that the intersection of the set of bugs and the set of cows is not empty; it must contain at least all the pins. Mathematically, $P \subseteq (B \cap C)$. If the set P is non-empty, then $B \cap C$ is non-empty.

Therefore, the conclusion "Some bugs are cows" logically follows.

Evaluating Conclusion (II): All cows are pins

The statements establish that all pins are cows ($P \subseteq C$). However, this relationship does not imply the reverse – that all cows must be pins ($C \subseteq P$).

It is possible for the set of cows (C) to contain members that are not pins. The given statements do not provide information to exclude this possibility.

Therefore, the conclusion "All cows are pins" does not logically follow.

Result

Based on the analysis, only Conclusion (I) is logically valid.

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