(1)In the integer 3589 the digits are all different and increase from left to right. How many integers between 4000 and 5000 have digits that are all different and that increased from left to right?

　　比較題目：(2)In the integer 3589 the digits are all different and increase from left to right. How many integers between 30000 and 50000 have digits that are all different and that increased from left to right?

　　(3)If p, r, m are three different prime numbers greater than 2, and n=p*r* m, how many positive factors, including 1 and n, does n have?

　　比較題目：(4)If p, r, m, n, t and s are six different prime numbers greater than 2, and n=p*r*s*m*n*t, how many positive factors, including 1 and n, does n have?

　　(5)If someone throws a dice twice, on the first time he gets a points, and on the second he gets b points, what is the probability a/b>1?

　　比較題目：(6)If someone throws a dice twice, what is the probability that the point he gets on one throw is bigger than the other?

　　(7)Mr. Jones must choose 4 of the following 5 flavors of jellybean: apple, berry, coconut, kumquat, and lemon, How many different combinations of flavors can Mr. Jones choose?

　　免責聲明：本站文章信息來(lái)源于網(wǎng)絡(luò )轉載是出于傳遞更多信息之目的，并不意味著(zhù)贊同其觀(guān)點(diǎn)或證實(shí)其內容的真實(shí)性。不保證信息的合理性、準確性和完整性，且不對因信息的不合理、不準確或遺漏導致的任何損失或損害承擔責任。本網(wǎng)站所有信息僅供參考，不做交易和服務(wù)的根據，如自行使用本網(wǎng)資料發(fā)生偏差，本站概不負責，亦不負任何法律責任，并保證最終解釋權。