Let Pi and Pi ' be the feet of the perpe...

Let `P_i` and `Pi '` be the feet of the perpendiculars drawn from the foci `Sa n dS '` on a tangent `T_i` to an ellipse whose length of semi-major axis is 20. If `sum_(i=0)^(10)(S P_i)(S^(prime)Pi ')=2560 ,` then the value of eccentricity is `1/5` (b) `2/5` (c) `3/5` (d) `4/5`

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Let P_i and P_i ' be the feet of the perpendiculars drawn from the foci Sa n dS ' on a tangent T_i to an ellipse whose length of semi-major axis is 20. If sum_(i=0)^(10)(S P_i)(S^(prime)Pi ')=2560 , then the value of eccentricity is (a) 1/5 (b) 2/5 (c) 3/5 (d) 4/5

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Let `P_i` and `Pi '` be the feet of the perpendiculars drawn from the foci `Sa n dS '` on a tangent `T_i` to an ellipse whose length of semi-major axis is 20. If `sum_(i=0)^(10)(S P_i)(S^(prime)Pi ')=2560 ,` then the value of eccentricity is `1/5` (b) `2/5` (c) `3/5` (d) `4/5`

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