二题GMATPrep:

PS:

1. 5 people are to be seated around a circular table. Two seating arrangement are considered different only when the positions of the people are different relative to each other. What is the total number of different possible seating arrangements for the group?

ANS: 24

DS:

2. Is Z equal to the median of the 3 positive intergers X, Y, Z ?

(1) X < Y + Z (2) Y = Z

ANS: (B)

somebody helps me?

1.P(4,4)

2。Y=Z，说明要不是X，Y（Z），要不是Y（Z），X；所以Z肯定是中数。