Answer:
They can be chosen in 6,840 different ways
Step-by-step explanation:
In this question, we are tasked with calculating the number of ways in which the 1st, 2nd and 3rd students can be chosen.
For the first position, we have 20 people vying for the position and we are to select only one for the position.
The number of ways this is achievable is 20C1 ways = 20 ways
For the second position, we are left with 19 students vying for the position and we are to select only one for the position. The number of ways this is possible is 19C1 ways = 19 ways
For the third position, we are left with 18 students vying for the position. The number of ways this is possible is 18C1 ways = 18 ways
Thus, the total number of ways this cane be done is; 20 ×19 ×18 = 6,840 ways
