Question

Permutation part 2 (Tutorial)
More examples! Awesome!

Answer 1

\(\Huge\color{red}{Permutation~part~2} \)

anybody who could not follow part 1 can click the link below.
http://openstudy.com/study#/updates/55d9654be4b0a0d51270edbf

Answer 2

\(\Large\color{red}{Q} \) How many even numbers are there with 3 digits such that if 5 is the one digit then seven is the next digit.
\(\Large\color{blue}{Ans} \)
Even numbers are 0,1,2,4,6,8


Case 1)