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If α , β ≠ 0, and f(n) = α n + β n and ) 4 ( f 1 ) 3 ( f 1 ) 2 ( f 1 ) 3 ( f 1 ) 2 ( f 1 ) 1 ( f 1 ) 2 ( f 1 ) 1 ( f 1 3 + + + + + + + + = K(1 – α ) 2 (1 – β ) 2 ( α – β ) 2 , then K is equal to -

1. – 1
2. αβ
3. αβ 1
4. 1

Correct answer: 1

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