Re: [計量] 請問一些計量問題謝謝

看板GRE作者ron0908 (榮恩)時間15年前 (2010/08/22 21:12)推噓4(4推 0噓 1→)

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※ 引述《leobigpig (leobigpig)》之銘言： : 這邊請教各位板友些計量問題 : (1) : Between 1 and 350, inclusive, what is the probability that a number is : selected from 337 to 350? : 答: 1/4 350-337+1 1 ----------- = ---- 350 25 如果題目沒少打其他條件就是答案有錯。 (選擇範圍這麼小怎麼可能到1/4機率的程度...) : (2) : Column A : The probability that a number selected from 1 to 19 odd. : Column B : 1/2 : 答: A 1到19間的奇數:1, 3, 5, 7, 9, 11, 13, 15, 17, 19 共10個 10/19 = 20/38 1/2 = 19/38 ans: (A) : (3) : The function △(M) is definied as the producted of m+4, m+5, m+6 for all : positive integer values of m. If n is a positive integer, : then △(n) must be divided by which of the following numbers? : (A) 4 (B) 5 (C) 6 (D) 7 (E) 11 : 答案是: C 這題有看過類似的...可是我算一下子找不到答案...奇怪~"~ : (4) : For any positive integer n, τ(n) represents the number of positive factors : of n, inclusive of 1 and itself. A and b are prime numbers. : Column A : τ(a) + τ(b) : Column B : τ(ab) : 答: D : 謝謝 τ(a) + τ(b) = 2 + 2 = 4 τ(ab) = 會有1, a, b, ab 四種情況，故τ(ab) = 4 但當a=b時(題目沒說不行) τ(ab)=3 B有可能小於A有可能等於A 故選(D) -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 180.177.10.201

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leobigpig

08/22 21:20, , 1^F

08/22 21:20, 1^F

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wawi

08/22 21:59, , 2^F

08/22 21:59, 2^F

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peala

08/22 23:41, , 3^F

08/22 23:41, 3^F