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Discrete Mathematics

GATE CSE 2014 Set 2 · Q50

MCQ2 marksHard

Time

Consider the following relation on subsets of the set SS of integers between 1 and 2014. For two distinct subsets UU and VV of SS we say U<VU < V if the minimum element in the symmetric difference of the two sets is in UU. Consider the following two statements: S1: There is a subset of SS that is larger than every other subset. S2: There is a subset of SS that is smaller than every other subset. Which one of the following is CORRECT?

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Solution

Step-by-step verified solution

Official answer: A) Both S1 and S2 are true

Discrete Mathematics

Given S={1,2,…,2014}S = \{1, 2, \dots, 2014\} and the relation U<V  ⟺  min⁡(UΔV)∈UU < V \iff \min(U \Delta V) \in U, where UΔV=(U∖V)∪(V∖U)U \Delta V = (U \setminus V) \cup (V \setminus U).

Let us test the extreme subsets of SS:

  1. Check U=SU = S (the entire set):

For any other subset V≠SV \neq S, the symmetric difference is:

SΔV=S∖VS \Delta V = S \setminus V

Since S∖V⊆SS \setminus V \subseteq S, its minimum element must belong to SS. Therefore, min⁡(SΔV)∈S\min(S \Delta V) \in S, which means S<VS < V for all V≠SV \neq S. Hence, SS is smaller than every other subset. This makes statement S2 TRUE.

  1. Check V=∅V = \emptyset (the empty set):

For any non-empty subset U≠∅U \neq \emptyset, the symmetric difference is:

UΔ∅=UU \Delta \emptyset = U

The minimum element min⁡(U)\min(U) belongs to UU. Thus, U<∅U < \emptyset for all U≠∅U \neq \emptyset, which means ∅>U\emptyset > U for all U≠∅U \neq \emptyset. Hence, ∅\emptyset is larger than every other subset. This makes statement S1 TRUE.

Since both S1 and S2 are true, option (A) is correct.

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This Discrete Mathematics previous year question is Q50 of the GATE CSE 2014 Set 2 paper. Find more GATE CSE PYQs on Discrete Mathematics in Engineering Mathematics, or browse all GATE CSE PYQs.

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Discrete Mathematics in GATE CSE

Discrete Mathematics has 50 GATE CSE PYQs across 23 papers from 2011 to 2026. 11 of them are 2-mark MCQs like this one, and GATE CSE 2014 Set 2 has 3.

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GateAI solution cardGATE CSE 2014 Set 2 · Q50 · MCQ

Consider the following relation on subsets of the set S of integers between 1 and 2014. For two distinct subsets U and V of S we say U < V if the minimum element in the symmetric difference of the two sets is in U. Consider the following two statements: S1: There is a subset of S that is larger than every other subset. S2: There is a subset of S that is smaller than every other subset. Which one of the following is CORRECT?

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Independent practice explanation verified by the GateAI team. GATE is conducted by the IITs; question text follows the official paper.