KVPY SX SB Exam 2012 Question Paper
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Question : 20 of 120
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Let S = {1,2,3,..., n) and
A = {(a, b) | 11 ≤ a, b ≤ n} = S × S . A subset B of A is said to be a good subset if (x, x ) ∈ B for every x ∈ S . Then the number of good subsets of A is
A = {(a, b) | 11 ≤ a, b ≤ n} = S × S . A subset B of A is said to be a good subset if (x, x ) ∈ B for every x ∈ S . Then the number of good subsets of A is
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