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Let ∑ = + + = n 1 j 2 2 j ) D Cn Bn ( A n S , where A, B, C, D ∈ N and A has least value. Then

1. A + C + D is not divisible by B
2. A + B = 5(D – C)
3. A + B + C + D is divisible by 5
4. A + B is divisible by D

Correct answer: A + B is divisible by D

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