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STD 11 - 6. permutation and combination — Maths STD 11 Science — Question

CBSE BoardEnglish MediumSTD 11 ScienceMathsSTD 11 - 6. permutation and combination1 Mark
MCQ
There are $3$ sections in a question paper and each section contains $5$ questions. A candidate has to answer a total of $5$ questions, choosing at least one question from each section. Then the number of ways, in which the candidate can choose the questions, is
  • A
    $1500$
  • B
    $2255$
  • C
    $3000$
  • ✓
    $2250$
✓

Answer

Correct option: D.
$2250$
d
$\begin{array}{lll} \text { A } & \text { B } & \text { C } \\ \hline 5 & \text { 5 } & \text { 5 } \\ \text { 1 } & 2 & 2 \\ \text { 2 } & 1 & 2 \\ 2 & 2 & 1 \\ 1 & 1 & 3 \\ 1 & 3 & 1 \\ 3 & 1 & 1 \end{array}$

Total number of selection

$=\left({ }^{5} C _{1}{ }^{5} C _{2}{ }^{5} C _{2}\right) \cdot 3+\left({ }^{5} C _{1}{ }^{5} C _{1}{ }^{5} C _{3}\right) \cdot 3$

$=5 \cdot 10 \cdot 10 \cdot 3+5 \cdot 5 \cdot 10 \cdot 3$

$=2250$

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