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

\(1,2,3,5,6,7\) अंको का उपयोग करके बिना पुनरावृत्ति के बनाई गयी \(5-\)अकों की संख्याओं की कुल संख्या, जो \(6\) के गुणज है, होगी

  1. A \(36\)
  2. B \(48\)
  3. C \(60\)
  4. D \(72\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(72\)

Step-by-step Solution

Detailed explanation

To make a no. divisible by \(3\) we can use the digits \(1,2,5,6,7\) or \(1,2,3,5,7\) Using \(1,2,5,6,7\), number of even numbers is \(=4 \times 3 \times 2 \times 1 \times 2=48\) Using \(1,2,3,5,7\), number of even numbers is \(=4 \times 3 \times 2 \times 1 \times 1=24\)…
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