Asecurity alarm requires a four digit code. the code can use 0-9 and the digits cannot be repeated. what is the approximate probability that the code only contains odd number

0.02381

Step-by-step explanation:

Given: The number of digits from which a security code is made (0-9) = 10

The number of odd digits (1, 3, 5, 7, 9 )= 5

By using Permutations , the number of ways to make a four digit number such that no digit is repeated :-

The number total number of ways of making four digit number from the 10 digits such that no digit is repeated:-

The probability that the code only contains odd number is given by :-

Hence, the approximate probability that the code only contains odd number = 0.02381

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step-by-step explanation:

-2x + 7 = 7

subtract 7 from both sides.

-2x = 0

divide both sides by -2.

x = 0