Akey code must contain 4 letters and 3 numbers. the letters may be any letter of the alphabet. the numbers should be any number from 0 to 5. how many different key code combinations are there?

We can choose any 4 of 26 letters

And we can choose any 3 of 6 numbers

And we have 7! arrangements of these letters and numbers

So we have

C(26,4)* C(6,3) *7! = 1,506,960,000 combinations

answer 1 : option "c"

answer 2 : option "d"

answer 3 : option "b"

answer 4 : option "d"

answer 5 : option "b"

answer 6 : option "a"

answer 7 : option "c"

answer 8 : option "d"

answer 9 : option "c"

answer 10 : option "d"

answer 11 : option "c"

answer 12 option "b"

answer 13 option "c"

answer 14 option "c"

answer 15 option "d"

answer 16 option "a"

answer 17 option "b"

answer 18 option "c"

answer 19 option "a"

answer 20 option "a"

answer 21 option "c"

d

correct answer is c. just did it

step-by-step explanation: