Since she has seven key the probability that the first one will open the door is

if it takes three attempts to open the door,the probability is

if the three attempts would not work
then the probability that the fourth attempt will open the door is

hope this helps
Answer:
0 - 1
Step-by-step explanation:
U can do by simple division method to get the answer
Answer: i dont know trie asking linder0917
Step-by-step explanation:
ok
26*5 is 130
He'll have ten left over if each student in year 11 has one :) Hope this helps!