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- Question 12 and 13, Exercise 6.2
- tal letters $=5$\\ Total possible arrangements of these $5$ letters $=5!=120$\\ Vowel letters in the give
- Question 14 and 15, Exercise 6.2
- possibile arrangements. ** Solution. ** To find these arrangement, we treat all books on one subject as
- Question 1(i-v), Exercise 6.3
- $0<r<n$.\\ Let $X$ be the total combinations. \\ These $r$ objects may be arranged in $r$ ! ways but all
- Question 9 and 10, Exercise 6.3
- 10$ in ${ }^{10} C_{7}$ ways had after choosing\\ these $7$ girls remaining $3$ girls can be chosen in on