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

અંકો \(0, 1, 3, 7, 9\) નો પુનરાવર્તન સહિત ઉપયોગ કરી \(7,000\) કરતાં નાની સંખ્યા કેટલી મેળવી શકાય .

  1. A \(250\)
  2. B \(374\)
  3. C \(372\)
  4. D \(375\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(374\)

Step-by-step Solution

Detailed explanation

\(\boxed{{a_1}}\boxed{{a_2}}\boxed{{a_3}}\) Number of numbers \( = {5^3} - 1\) \(\boxed{{a_4}}\boxed{{a_1}}\boxed{{a_2}}\boxed{{a_3}}\) \(2\) ways for \({a_4}\) Numbers of numbers \( = 2 \times {5^3}\) Required number \(0020 = {5^3} + 2 \times {5^3} - 1\) \(= 374\)
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