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

દરેક સાત અંકો \(1, 2, 2, 2, 3, 3, 5\) નો ઉપયોગ કરીને બનતી સાત અંકી વિષમ સંખ્યાઓની સંખ્યા \(................\) છે.

  1. A \(238\)
  2. B \(240\)
  3. C \(239\)
  4. D \(235\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(240\)

Step-by-step Solution

Detailed explanation

Digits are \(1,2,2,2,3,3,5\) If unit digit \(5\) , then total numbers \(=\frac{6 !}{3 ! 2 !}\) If unit digit \(3\) , then total numbers \(=\frac{6 !}{3 !}\) If unit digit \(1\) , then total numbers \(=\frac{6 !}{3 ! 2 !}\) \(\therefore\) total numbers \(=60+60+120=240\)
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