Answer:
840
Step-by-step explanation:
Given


Required
Determine the number of rankings
The term "ranking" as used in this question implies permutation and the required is calculated using:

Where


So:






<em>Hence, number of ranking is 840</em>
Answer:10
Step-by-step explanation:
Answer: I think the last one sorry of I am wrong
Step-by-step explanation:
7 squared = 49 and 9 squared= 81 add up 49 and 81 and you get 130