what is the least number n with the property that, in every group of n people, there are at least three people who are all friends (each knows the other two) or all strangers (none of them knows either of the other two)

answer: the answer is one of

step-by-step explanation:   we are given to write a proper fraction where the whole is divided into an even number of equal parts less than ten, and an odd number of those parts exist.

an even number less than 10 may be one of 2, 4, 6 or 8. so, the whole may be one of these four evens.

now, an odd number of these parts must exist, so the numerator must be an odd number, one of 1, 3, 5 or 7. it cannot be 9 because then the fraction will become improper.

thus, our fraction may be one of the following

what do you need me to answer?

step-by-step explanation:

i believe the answer is d.

hope it you! : d