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If (A={1,2,3,4,5,6}) and (R={(a,b):a^2+b^2\text{ is divisible by }10}), how many diagonal pairs are already in (R)?

Answer and explanation

Correct answer: 1

Step 1: On the diagonal, (a^2+b^2=2a^2). Step 2: For divisibility by (10), (2a^2) must include a factor (5), so (a) must be divisible by (5). Step 3: In the given set, only (a=5) works, so there is one diagonal pair.

Related tags

Reflexive RelationSquaresDivisibilityClass 12Relations And FunctionsMathematicsClass 12 Mcq

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