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Q.

If log1/2⁡(4−x)≥log1/2⁡2−log1/2⁡(x−1),then x belongs to

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a

(1,2]

b

[3,4)

c

(1,3]

d

[1,4)

answer is A.

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Detailed Solution

log1/2⁡(4−x)≥log1/2⁡2−log1/2⁡(x−1) or     log1/2⁡(4−x)(x−1)≥log1/2⁡2 or     (4−x)(x−1)≤2 or     x2−5x+6≥0 or     (x−3)(x−2)≥0 or     x≥3 or x≤2 But     x∈(1,4)⇒     x∈(1,2]∪[3,4)
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