Permuatation and combination

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Question 47

$\begin{align}  & \text{In how many ways can a students select  2 subjects from 5 subjects} \\ & \text{(A) }\frac{5!}{2!}\text{  (B) }\frac{5!}{3!}\text{  (C) }\frac{5!}{2!2!}\text{  (D) }\frac{5!}{2!3!} \\\end{align}$

Question 11

Raila has 7 different posters to be hanged in her bedroom, living room and kitchen. Assuming she has plans to place at least a poster in each of the 3 rooms how many choices does she have?

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