Question

The following are the steps involved in finding the value of `(n)/(r)` from `.^(n)P_(r)=1320`. Arrange them in sequential order.
A. `.^(n)P_(4)=(12!)/(9!)=(12!)/((12-3)!)`
B. `rArr(n)/(r)=(12)/(3)=4`
C. `rArr.^(n)P_(r)=.^(12)P_(3)`
D. `.^(n)P_(r)=1320=12xx11xx10`

Answer 1

DACB is the required sequential order.