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Let S = { n :1 ≤ n ≤ 50 and n is odd} Let a ∈ S and A = 1 0 a 0 1 1 a 0 1 − − If ∑ ∈ S a det (adj A) = 100 λ , then λ is equal to :

1. 218
2. 221
3. 663
4. 1717

Correct answer: 221

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