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Maurinko [17]
3 years ago
10

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

and numbers can be used more than once. What is the probability someone can guess the correct combination given 100 attempts?
Mathematics
1 answer:
Sonbull [250]3 years ago
5 0

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

∴ Probability someone can guess the correct combination given 100 attempts is \mathbf{\frac{1}{270}=0.00370}

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C

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Multiplying out the equation (x + 2)(4x - 3) and arranging in descending powers order gives us the quadratic form as; 4x² + 5x - 6

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2. a number decreased by 34      n - 34

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