 
 <translate> The question is: Joey is planning to throw a small party and for that he needs to do the following tasks:
I. Decide guest list
II. Send invites
III. Arrange catering
IV. Decide the venue
V. Rent a music system
The tasks can be done in any order as long as the invites are sent after the guest list is decided. In how many ways can Joey do the five tasks listed above?
Options:
(A) 24
(B) 48
(C) 60
(D) 120
(E) 240
Step-by-step reasoning process: These 5 tasks can be arranged in 5! = 120 ways. In half of them invites are sentafterthe guest list is decided and in half of them before. So, there are total of 120/2 = 60 ways to arrange the task so that the invites are sent after the guest list is decided.
 <ibo> Ajụjụ bụ: Joey na-eme atụmatụ ime obere oriri na maka nke ahụ ọ chọrọ ịrụ ọrụ ndị a: I. Kpebie ndepụta ndị ọbịa Nke abụọ. Ziga akwụkwọ ịkpọ òkù Nke atọ. Kwadebere gị nri Nke anọ. Kpebie ebe a ga-eme ya V. Ịkwụ ụgwọ ihe e ji akpọ egwú A pụrụ ịrụ ọrụ ndị ahụ n'usoro ọ bụla ma ọ bụrụhaala na a na-ezipụ akwụkwọ ịkpọ òkù mgbe e kpebichara ndị a ga-akpọ òkù. N'ụzọ ole ka Joey pụrụ isi rụọ ọrụ ise ahụ e depụtara n'elu? Nhọrọ: (A) 24 (B) 48 (C) 60 (D) 120 (E) 240 Nzọụkwụ site na usoro ntụgharị uche: A pụrụ ịhazi ọrụ 5 ndị a n'ụzọ 5! = ụzọ 120. N'ọkara n'ime ha, a na-ezipụ akwụkwọ ịkpọ òkù mgbe e kpebichara ndị a ga-akpọ òkù na ọkara n'ime ha tupu oge eruo. Ya mere, e nwere ngụkọta nke 120/2 = ụzọ 60 iji hazie ọrụ ahụ ka a na-eziga akwụkwọ ịkpọ òkù mgbe e kpebiri ndepụta ndị ọbịa. 