Question 15 Marks
| Part (a) | Part (b) |
| 1. ${ }^n P _4=20 \times{ }^n P _2$, then the value of $n$ | (a) 14 |
| 2. ${ }^{2 n+1} P _{n-1}:{ }^{2 n-1} P _n=3: 5$, then the value of $n$ | (b) 5 |
| 3. ${ }^{15} P _{r-1}:{ }^{16} P _{r-2}=3: 4$, then the value of $r$ | (c) 7 |
| 4. ${ }^n P _5:{ }^n P _3=2: 1$, then the value of $n$ | (d) 91 |
| 5. If ${ }^n C _8={ }^n C _6$, then the value of ${ }^n C _2$ | (e) 4 |
Answer
View full question & answer→(1-c), (2-e), (3-a), (4-b), (5-d)