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If a set (A) has (4) elements, what is the total number of symmetric relations on (A)?

Answer and explanation

Correct answer: (2^{10})

Step 1: The number of symmetric relations on a set with (n) elements is (2^{\frac{n(n+1)}{2}}). Step 2: Here (n=4), so the number of independent choices is (\frac{4\cdot5}{2}=10). Step 3: Remember that diagonal pairs are chosen singly, while off-diagonal pairs are chosen in reverse-pair groups.

Related tags

RelationsSymmetric RelationCounting FormulaClass 12Relations And FunctionsMathematicsClass 12 Mcq

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