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The length of the chord of the ellipse 25 x 2 + 16 y 2 = 1, whose mid point is ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ 5 2 , 1 , is equal to :

1. 5 2009
2. 5 1691
3. 5 1541
4. 5 1741

Correct answer: 5 1691

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