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

ધારો કે  \(\mathrm{n}\) એ અનૃણ પૂર્ણાંક છે તો  \((10)^{10} \cdot(11)^{11} \cdot(13)^{13}\) ના  " \(4 \mathrm{n}+1\) " સ્વરૂપના ભજકોની સંખ્યા મેળવો.

  1. A \(924\)
  2. B \(750\)
  3. C \(125\)
  4. D \(654\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(924\)

Step-by-step Solution

Detailed explanation

\(\mathrm{N}=2^{10} \times 5^{10} \times 11^{11} \times 13^{13}\) Now, power of \(2\) must be zero, power of \(5\) can be anything, power of \(13\) can be anything. But, power of \(11\) should be even. So, required number of divisors is \(1 \times 11 \times 14 \times 6=924\)
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