Answer:
k = -2
Step-by-step explanation:
If 
Then

So

From this follows k = -2
Slot method
8 optionns n 1st slot
7 options in 2nd slot (since 1 is at 1st slot)
6 options in 3rd slot
5 options in 4th slot
8*7*6*5=1680 ways
Answer:
what does it pass through
Answer:
The answer is 5
Step-by-step explanation:
Hope it helps <3 c: