The set of real values of x for which the inequality log278 ≤ log3x < 91log23 holds is
Explanation:
Given, log278 ≤ log3x < 91log23
⇒ log3323 ≤ log3x < 9log32
⇒ 33log32 ≤ log3x < 2log39
⇒ log32 ≤ log3x < 22
⇒ log32 ≤ log3x < 4
⇒ log32 ≤ log3x < log334
⇒ 2 ≤ x < 81
∴ x ∈ [2, 81)
Hence, option (a).
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