When choosing a four-number PIN. (personal identification number)
how many different PINS are possible?

(The choice of digits 0-9 are available for each number.)

Theoretically, there are 10,000 possible four-digit combinations the numbers 0 to 9 can be arranged into, and if everyone selected a number entirely at random that would offer a reasonable level of protection.Step-by-step explanation:

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the answer is:

the correct option:

b.

to solve the problem, we need to remember how to operate to simplify exponential expressions using the logarithms.

we are given the equation:

then, using placing logarith with base 7 on both sides of the equation, we have:

so, rounding the obtained result to two decimal places (nearest hundreth), we have:

hence, we have that the correct option:

b.

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answer: 72: 111

step-by-step explanation: