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

જો \({ }^{1} \mathrm{P}_{1}+2 \cdot{ }^{2} \mathrm{P}_{2}+3 \cdot{ }^{3} \mathrm{P}_{3}+\ldots+15 \cdot{ }^{15} \mathrm{P}_{15}={ }^{\mathrm{q}} \mathrm{P}_{\mathrm{r}}-\mathrm{s}, 0 \leq \mathrm{s} \leq 1\) હોય તો  \({ }^{\mathrm{q}+\mathrm{s}} \mathrm{C}_{\mathrm{r}-\mathrm{s}}\) ની કિમંત મેળવો.

  1. A \(136\)
  2. B \(1\)
  3. C \(16\)
  4. D \(13\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(136\)

Step-by-step Solution

Detailed explanation

\({ }^{1} \mathrm{P}_{1}+2 \cdot{ }^{2} \mathrm{P}_{2}+3 \cdot{ }^{3} \mathrm{P}_{3}+\ldots+15 \cdot{ }^{15} \mathrm{P}_{15}\) \(=1 !+2.2 !+3.3 !+\ldots .15 \times 15 !\) \(=\sum_{\mathrm{r}=1}^{15}(\mathrm{r}+1-1) \mathrm{r} !\)…
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