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Q.

The number of real roots of the quadratic equation k=1n(xk)2=0,(n>1) is :

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a

2

b

n

c

1

d

0

answer is D.

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Detailed Solution

k=1n(xk)2=(x1)2+(x2)2+.........+(xn)2>0 for all xR  It is completely above x-axis, hence it has no  real roots .

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