IIT-JEE Exam

The positive value of k for which kex − x = 0 has only one root is
(A) 1/e (B) 1
(C) e (D) loge2

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IIT-JEE Other Question

If |z| = 1 and z ≠ ± 1, then all the values of then z/(1-z^2) lie on For k > 0, the set of all values of k for which k e^x − x = 0 has two distinct roots is