If P is a point on the ellipse \(\rm \frac{{{x^2}}}{{{a^2}}} + \frac{ – McqOptions

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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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