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Question

All the values of m for which both the roots of x22mx+m21=0 are greater than 2 but less than 4, lies in the interval

A
(1,3)
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B
(3,)
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C
(2,0)
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D
(2,4)
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Solution

The correct option is A (1,3)
Let f(x)=x22mx+m21, whose roots are α,β
Given: 2<αβ<4


Conditions:
(i) Δ04m24(m21)04>0mR (1)

(ii) f(2)>0m2+4m+3>0(m+1)(m+3)>0m<3 or m>1 (2)

(iii) f(4)>0m28m+15>0(m3)(m5)>0m<3 or m>5 (3)

(iv) 2<b2a<42<m<4 (4)

From (1),(2),(3) and (4), we get
m(1,3)

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