WBJEE · Maths · Permutation Combination
What is the number of ways in which an examiner can assign 10 marks to 4 questions, giving not less than 2 marks to any questions?
- A 4
- B 6
- C 10
- D 16
Answer & Solution
Correct Answer
(C) 10
Step-by-step Solution
Detailed explanation
\(x_{1}+x_{2}+x_{3}+x_{4}=10 \quad x_{i} \geq 2\) \(\Rightarrow\left(x_{1}-2\right)+\left(x_{2}-2\right)+\left(x_{3}-2\right)+\left(x_{4}-2\right)=2\) \(\begin{array}{llll}\mathrm{y}_{1} & \mathrm{y}_{2} & \mathrm{y}_{3} & \mathrm{y}_{4}\end{array}\)…
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