Question

explain pigeon hole principle.using this principle show that in any group of 36 people we can always find 6 people who were born on the same day of week.

Answer 1

"any group" and "always" seem wrong

could have almost all born on a Wednesday, for example, though unlikely

probably means "at least 6 people"

Answer 2

Take the first 35 and spread their birthdays evenly through the week, making 5 per each day. Additional person must go to one of those days, making 6 on that day.