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Let l n (x) = ∫ + x 0 n 2 dt ) 5 t ( 1 , n = 1, 2, 3, ..... Then

1. 50 l 6 – 9 l 5 = x l ′ 5
2. 50 l 6 – 11 l 5 = x l ′ 5
3. 50 l 6 – 9 l 5 = l ′ 5
4. 50 l 6 – 11 l 5 = l ′ 5

Correct answer: 50 l 6 – 9 l 5 = x l ′ 5

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