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Question

Set of values of a for which point P(2,4) lies inside the parabola y2=4ax is

A
a(,2)
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B
a(2,)
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C
a(,2)
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D
a(2,)
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Solution

The correct option is D a(2,)
y2=4axS=y24ax
P(2,4) lies inside parabola, so
S1=424×a×2<0
2a<0
a>2
Hence, a(2,)

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