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[美國直購 ShopUSA] Intel 台式機主板 Desktop Board LGA775 microATX DB43LD BLKDB43LD $5639

功能:

[美國直購 ShopUSA] Intel 台式機主板 Desktop Board LGA775 microATX DB43LD BLKDB43LD $5639

描述:

20120406k_KDB43LD
?

Essentials	?
Status	?End of Life
Launch Date	?Q2'09
Board Form Factor	?microATX
Socket	?LGA775
Memory Specifications	?
Max Memory Size (dependent on memory type)	?8 GB
Memory Types	?DDR2-800/667
# of Memory Channels	?2
# of DIMMs	?2
Graphics Specifications	?
Integrated Graphics	?Yes
Graphics Output	?DVI-D, VGA
Dual Display Capable	?Yes
Discrete Graphics	?PCIe x16
Expansion Options	?
PCI Support	?2
PCIe x1 Gen 2.x	?1
PCIe x16 Gen 2.x	?1
I/O Specifications	?
USB 2.0 Configuration (Back + Internal)	?4+6
# of SATA Ports	?6
# of eSATA Ports	?1
RAID Configuration	?N/A
# of Parallel Ports	?1
# of Serial Ports	?1
Audio (back channel + front channel)	?6-ch
Integrated LAN	?10/100/1000
Firewire	?0+0
Package Specifications	?
Max CPU Configuration	?1
Energy Star	?Yes
Low Halogen Options Available	?See MDDS
Advanced Technologies	?
Intel? AMT Version	?Standard Manageability (Upgradeable)
Intel? Quiet System Technology	?Yes
Intel? HD Audio Technology HP 9芯 MS09 日系電芯 電池 EH767AA EH768AA RW556AA DB22 DB23 FB21 FB22 DB78 【雙11來了！限時下殺】【Dennys】USB-FM-SD-MP3迷你擴大機藍芽特別版(AV-262) [106美國直購] 2017美國暢銷軟體 MathXL Standalone Access Card (6-month access) 【雙11來了！限時下殺】【免運費】Motorola BT50 原廠電池【配件包】附保證卡W230 W231 W270 W355 W371 W375 W396 W510 W562 Golla 14吋北歐潮流手提保護套(雅痞橘) G1477 適用14吋(含)以下筆電 防潑水及耐髒表面處理 【雙11來了！限時下殺】Electrolux伊萊克斯Twinclean專用 HEPA 可水洗濾網EF78-EF-78一組(2顆)	?Yes

標題:

拜託高手解答數學的機率計算問題！

發問:

A fleet of nine taxis is to be dispatched to three airports in such a way that three go to airport A, five go to airport B, and one goes to airport C. (a) In how many distinct ways can this be accomplished? (b) If exactly one of the taxis is in need of repair, what is the probability that it is dispatched to... 顯示更多 A fleet of nine taxis is to be dispatched to three airports in such a way that three go to airport A, five go to airport B, and one goes to airport C. (a) In how many distinct ways can this be accomplished? (b) If exactly one of the taxis is in need of repair, what is the probability that it is dispatched to airport C? (c) If exactly three of the taxis are in need of repair, what is the probability that every airport receives one of the taxis requiring repairs?

最佳解答:

(a) Out of 9 taxis, 1 goes to airport C. (9C1) Out of the rest 8 taxis, 5 go to airport B. (8C5) The rest 3 taxis go to airport A. (3C3) No. of ways this can be accomplished = 9C1 x 8C5 x 3C3 = 9 x (8!/5!3!) x 1 = 504 (b) When the event happens : The taxi needed repair is dispatched to airport C. (1C1) Out of the rest 8 taxis, 5 go to airport B. (8C5) The rest 3 taxis go to airport A. (3C3) The required probability = (1C1 x 8C5 x 3C3)/ (9C1 x 8C5 x 3C3) = 1C1 / 9C1 = 1/9 (c) When the event happens : The 3 taxis needed repair go the 3 different airports. (3P3) Out of the rest 6 taxis, 4 go to airport B. (6C4) The rest 2 taxis go to airport A. (2C2) The required probability = [3P3 x 6C4 x 2C2]/ 504 = [3! x (6!/4!2!) x 1] / 504 = [6 x 15 x 1] / 504 = 5/28

其他解答:

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[美國直購 ShopUSA] Intel 台式機主板 Desktop Board LGA775 microATX DB43LD BLKDB43LD $5639

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