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If n 1 i i } a { = , where n is an even integer, is an arithmetic progression with common difference 1, and ∑ = n 1 i i a = 192, ∑ = 2 / n 1 i i 2 a = 120, then n is equal to :

1. 48
2. 96
3. 92
4. 104

Correct answer: 96

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