Question

tom and john are to sit in a row of 11 seats with 9 other people. how many ways are there for the 11 people to sit if tom sits to the left of john?

Answer 1

since 2 tom and john are sitting together(adjacent to each other) so
we take both as one...
so in layman term
there are 10 seat avialable and 10 candidate to seat (9 + 1 (for both tom and john))

Answer 2

answer will be 10P10 =10!
ie 120