Discussion

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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