Teaching Chandigarh JBT PRT Mock Test 2023-24 Mathematics Quadratic Equations Common Roots

If the equation (m - n)x2 + (n - l)x + l - m = 0 has equal roots, then l, m and n satisfy

1
2l = m + 1
2
2m = n + l
3
m = n + l
4
l = m + n
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