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a
s={1}
b
S=Z
c
S=N
d
none of these
answer is A.
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Detailed Solution
2+log2x+1>1−log1/24−x2⇒ 1+log2x+1−log24−x2>0 or log22+log2x+1−log24−x2>0 or log22x+14−x2>0 or 2x+14−x2>1∴ 4(x+1)>4−x2∴ x2+4x>0 x<−4 or x>0----IAlso,x+1>0 or x>−1and 4−x2>0or x∈(−2,2)∴x∈(0,2)⇒x=1, as x∈N