Different codes for access code which are available are: 4000
_ _ _ _
1 2 3 4
1st blank can be filled with the following possibilities, here the conditions are:
1)The first digit cannot be 4
2)The first digit cannot be 0 also since it makes the access code 3 digits hence
From 1 to 9 except 4 there are 8 possible ways to fill that blank
<u>8</u>
2nd blank can be filled with any number between 0 to 9 in 10 possible ways
<u>8</u> <u>10 </u>
3rd blank can be filled with any number between 0 to 9 in 10 possible ways
<u>8</u> <u>10</u> <u>10</u>
4th blank can be filled with any odd numbers between 0 to 10 - 1,3,5,7,9
<u>8</u> <u>10</u> <u>10</u> <u>5</u> = 8 x 10 x 10 x 5 = 4000
Hence to conclude that 4000 available codes are there for the access security card
To know more about permutations and combinations please follow this link
brainly.com/question/1216161
