Evaluate 1/(log_2 π) + 1/(log_6 π).
Aptitude
Logarithm
Difficulty: Medium
Choose an option
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Agreater then 1
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Bless than 1
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Cbetween 5 and 6
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DNone of these
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E—
Answer
Correct Answer: greater then 1
Explanation
Introduction / Context:Use the reciprocal log identity: 1/log_a b = log_b a (a, b > 0, a, b ≠ 1). This lets us express the sum in a common base and combine using log addition rules.
Given Data / Assumptions:
- Terms: 1/(log_2 π) and 1/(log_6 π).
- π ≈ 3.1416; bases 2 and 6 are valid (≠ 1).
Concept / Approach:
- 1/log_a b = log_b a ⇒ 1/log_2 π = log_π 2; 1/log_6 π = log_π 6.
- Sum ⇒ log_π 2 + log_π 6 = log_π (12).
Step-by-Step Solution:
S = log_π 2 + log_π 6 = log_π (12)Since 12 > π (≈ 3.1416), log_π (12) > 1Verification / Alternative check:Compute approximately: ln 12 / ln π ≈ 2.4849 / 1.1447 ≈ 2.17 > 1.
Why Other Options Are Wrong:
- “Less than 1” contradicts 12 > π.
- “Between 5 and 6” grossly overestimates.
- “None of these” is incorrect since “greater than 1” is true.
Final Answer:greater then 1