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    				| 1. | The all possible values of a for which one root of the equation (a – 5)x2 – 2ax + a – 4 = 0 is smaller than 1 and the other greater than 2 is (a) [5, 24) (b) (5, 24] (c) (5, 24) (d) none of these | 
| Answer» Correct option (c) (5, 24) Explanation: D ≥ 0 (–2a)2– 4(a – 5) (a – 4) ≥ 0 ⇒ 9a –20 ≥ 0 a ≥ 20/9 .......(1) (a –5) ƒ(1) < 0 (a –5) (a–5 –2a + a – 4) < 0 (a –5) (–a) < 0 a > 5 ........(2) (a –5) ƒ(2) < 0 (a –5) (4(a – 5) – 4a + a – 4) < 0 ⇒ (a – 5) (a – 24) < 0 ⇒ 5 < a < 24 .........(3) From (1), (2), and (3) a ∈ (5,24) | |