On A = {0, 1, 2, …, 10}, R = {(a, b) : |a − b| is a multiple of 3}. The elements related to 1 are
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Answer: B. {1, 4, 7, 10}
|1 − b| ∈ {0, 3, 6, 9} gives b = 1, 4, 7, 10.
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