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Question

Point (1,2) lies _____ the ellipse x216+y29=1.

A
inside
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B
outside
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C
on
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D
None of the above
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Solution

The correct option is A inside
The region (disk) bounded by the ellipse is given by the equation:
(xh)2a2+(yk)2b21 centered at (h,k) ..... (1)
Point (x,y) lies inside the ellipse if it satisfies (1)
Take (x,y)=(1,2)
Consider, (x0)216+(y0)29

=1216+229=73144<1
Hence, (1,2) lies inside the given ellipse.

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