If p > q >1 and 0 < a < 1 then which of the following is correct option?

If p > q >1 and 0 < a < 1 then which of the following is correct option? Correct Answer log<sub>a</sub>(p – a) &lt; log<sub>a</sub>(q – a)

Explanation:

For a log function with base a as 0 < a < 1, the graph of the function can be drawn as bellow

[ alt="F16 Yerra 25-6-2021 Swati D2" src="//storage.googleapis.com/tb-img/production/21/06/F16_Yerra_25-6-2021_Swati_D2.png" style="width: 250px; height: 195px;">

The above graph is valid for,

x > 0 and 0 < a < 1

Since the function y = logax is a decreasing function for base a ∈ (0, 1). So, while operating loga on a given inequality, the sign of the inequality will change.

Calculation:

Given:

p > q > 1

⇒ (p – 1) > (q – 1) > 0

Operating log function on both sides,

⇒ loga(p -1) < loga(q - 1)

⇒ Option 3 is correct.

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