Since in a pass code, the placement of the digits is
important, therefore this means that to solve for the total number of
possibilities we have to make use of the principle of Permutation. The formula
for calculating the total number of possibilities using Permutation is given
as:
P = n! / (n – r)!
where,
n = is the total amount of numbers to choose from = 20
r = is the total number of digits needed in the passcode =
4
Therefore solving for the total possibilities P:
P = 20! / (20 – 4)!
P = 20! / 16!
P = 116,280
<span>Hence there are a total of 116,280 possibilities of pass
codes.</span>
Answer: 5/8 or 0.625
Step-by-step explanation:
3/2x1/4= 3/8
Then, 3/8x5/3= 15/24
15/24 simplified equals 5/8. 5/8 in decimal form is 0.625
Answer:
25.333332 years
Step-by-step explanation:
19/3
=6.333333*4
Answer:
150.12
Step-by-step explanation:
From the observation deck of a lighthouse 70 meters above sea level, the lighthouse keeper can see a fishing boat at a 25 degree angle of depression.What is the horizontal distance, to the nearest meter, from the base of the lighthouse to the fishing boat?
We solve the above question using the Trigonometric function of tan
tan y = Opposite /Adjacent
y = 25°
Opposite = 70m
Adjacent = x = Horizontal distance
Therefore:
tan 25 = 70m/x
tan 25 × x = 70m
x = 70m/tan 25
x = 150.11548444m
Approximately = 150.12m
The horizontal distance, to the nearest meter, from the base of the lighthouse to the fishing boat is 150.12m