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If the equation (m-n)x^(2)+(n-1)x+1-m=0 ...

If the equation `(m-n)x^(2)+(n-1)x+1-m=0` has equal roots, then l, m and n satisfy

A

2l=m+n

B

2m=n+l

C

m=n+l

D

l=m+n

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The correct Answer is:
B
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