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

तीन अंको की कुल संख्याऐं, जिनमें एक अंक की ठीक दो बार पुनरावृति ही, होगी -

  1. A \(256\)
  2. B \(289\)
  3. C \(243\)
  4. D \(237\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(243\)

Step-by-step Solution

Detailed explanation

If 0 taken twice then ways \(=9\) If 0 taken once then \({ }^{9} C _{1} \times 2=18\) If 0 not taken then \({ }^{9} C _{1}{ }^{8} C _{1} \cdot 3=216\) Total \(=243\)
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