1.

If P is a point on the ellipse \(\rm \frac{{{x^2}}}{{{a^2}}} + \frac{{{y^2}}}{{{b^2}}} = 1\), where foci are s and s', then the value of (SP + S'P) is equal to

A. 2a
B. 2b
C. (a+b)/2
D. (a-b)/2
Answer» B. 2b


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