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JEE Mains · Maths · STD 11- 2. Relation and Function

જો વિધેય \(f(x)=\log _7\left(1-\log _4\left(x^2-9 x+18\right)\right)\) નો પ્રદેશ \((\alpha, \beta) \cup(\gamma, \delta)\) હોય, તો \(\alpha+\beta+\gamma+\delta\) = __________

  1. A \(18\)
  2. B \(16\)
  3. C \(15\)
  4. D \(17\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(18\)

Step-by-step Solution

Detailed explanation

\(\begin{aligned} & \text { Domain } 1-\log _4\left(x^2-9 x+18\right) \gt 0 \\ & \text { Also } x^2-9 x+18 \gt 0 \\ & (x-3)(x-6) \gt 0\end{aligned}\) \(x \in(-\infty, 3) \cup(6, \infty)\) ...(1)…
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