6 digited passwords will be formed by using the numbers 1,2,3,4,5,6,7,8. If the last digit is 8, the 1st digit must be 1. How many different passwords can be formed? Answer: 233472 I need a full solution, please!!!

Question

imqwerty · Answer

ok so total combinations=
total combinations in which 8is at the last place and 1 at 1st place
+
total ways in which 8 is not at the last place

note that we can repeat the numbers in our combinations :)

imqwerty · Answer

ur facing prblm in which part?

anonymous · Answer

i really have no idea :(

anonymous · Answer

if the last digit is 8 --- 6.6.6.6=1296 possibilities am i right

imqwerty · Answer

No
u can also fill those four places with  1 and 8

anonymous · Answer

so 8.8.8.8=4096
if not 8 --- 8.8.8.8.8.7=229376
if we add both 233472

imqwerty · Answer

yes :) correct

anonymous · Answer

i'm so happy i've finally solved a possibility qoestion :) thank you

imqwerty · Answer

hahaah :D  your welcome (: