Given, one root of x2 - 6kx + 5 = 0 is 5. ∴ x = 5 satisfies x2 - 6kx + 5 = 0 ⇒ 52 - 30k + 5 = 0 ⇒ 25 - 30k + 5 = 0 ⇒ 30 - 30k = 0 ⇒ 30k = 30∴ k = 1
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