3 years ago

What is the measure of DAB in the parallelogram ABCD

1 answer:

5 0

AFD = 49
49 + 58 = 108
DAF = 180 - 108 = 72

BFD = 180 - 49 = 131
131 + 20 = 151
BAF = 180 - 151 = 29

DAB = 29 + 72 = 101
DAB = 101

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A combination lock requires a user to select three numbers to unlock it, where all three numbers are between 1 to 30, inclusive,

Sonbull [250]

Answer:

$\frac{1}{270}=0.00370$

Step-by-step explanation:

As the numbers are only between 1 and 30

Total number of possible combinations = 30×30×30 = 27000

If there are 100 attempts then

$\text{P (someone guesses correct)}=\frac{\text{Number of attempts}}{\text{Total number of possible combinations}}\\\Rightarrow \text{P (someone guesses correct)}=\frac{100}{27000}\\\Rightarrow \text{P (someone guesses correct)}=\frac{1}{270}=0.00370$