At the point P(a , a^n) on the graph of ...

At the point `P(a , a^n)` on the graph of `y=x^n ,(n in N),` in the first quadrant, a normal is drawn. The normal intersects the `y-a xi s` at the point `(0, b)dot` If `("lim")_(avec0)b=1/2,` then `n` equals 1 (b) 3 (c) 2 (d) 4

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