Answer:
<em>19800 seconds, or 330 minutes, or 5 hours + 30 minutes</em>
Step-by-step explanation:
<u>Number Permutations</u>
We know the phone number has 7 digits, 4 of which are known by Mark. This leaves him 3 digits to guess with. We also know the last one is not zero. The number can be represented as
XXY
Where X can be any digit from 0 to 9 and Y can be any digit from 1 to 9. The first two can be combined in 10x10 ways, and the last one can be of 9 ways, this gives us 10x10x9 = 900 possible permutations.
If each possible number takes him 22 seconds, every possibility will need
22x900=19800 seconds, or 330 minutes, or 5 hours + 30 minutes
He ANWSER I got would be c idk if this is right or not I honk it might be
Answer:
235 is not Prime. It’s Composite.
Step-by-step explanation:
Factors of 235:
1, 5, 47, 235.
1 x 235 = 235,
47 x 5 = 235.
Prime Numbers have the number 1 and the number it's self.
This number has 4 factors, which means it’s composite,
Composite Numbers have 3 or more factors.
