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A security alarm requires a four-digit code. The code can use the digits 0-9 and the digits cannot be repeated
Which expression can be used to determine the probability of the alarm code beginning with a number greater than 72
(@P})(P3)
10P4
(25)(C3)
1004
60P;) (gP3)
10P4
1064)(C3)
10C

Respuesta :

MathPhys

Answer:

₂P₁ ₉P₃ / ₁₀P₄

Step-by-step explanation:

There are 2 digits greater than 7 (8 and 9).  The number of ways you can select 1 digit from 2 is ₂P₁.

After the first digit is selected, there are 9 digits left.  The number of ways you can select 3 digits from 9 is ₉P₃.

The total number of ways you can select 4 digits from 10 is ₁₀P₄.

Therefore, the probability that the code starts with a number greater than 7 is:

₂P₁ ₉P₃ / ₁₀P₄

jleyva06

Answer:

a

Step-by-step explanation:

right on edge

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