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JEE Mains · Maths · STD 11 - 6. permutation and combination

\(4\)-अंकों की संख्याओं, जिनका \(18\) के साथ महत्तम सर्वनिष्ठ भाजक \(3\) है, की कुल संख्या है .............. 

  1. A \(1000\)
  2. B \(1500\)
  3. C \(1200\)
  4. D \(500\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(1000\)

Step-by-step Solution

Detailed explanation

Let \(N\) be the four digit number \(\operatorname{gcd}(N, 18)=3\) Hence \(N\) is an odd integer which is divisible by \(3\) but not by \(9 .\) \(4\) digit odd multiples of \(3\) \(1005,1011, \ldots \ldots, 9999 \rightarrow 1500\) \(4\) digit odd multiples of \(9\)…
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