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At the point `P(a,a^n)` on the graph of `y=x^n(ninN)` in the first quadrant a normal is drawn . The normal Intersects the y-axis at the point (0,b). If `lim_(a-0)b=1/2,` then n equals

A

2

B

4

C

5

D

6

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The correct Answer is:
A
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