22
A researcher plans to identify each participant in certain medical experiment
with a code consisting of either a single letter or a pair of distinct letters
written in alphabetical order. What is the least number of letters that can
be used if there are 12 participants, and each participant is to receive a
different code?
Ans 5
我自己算8><
34
Of the 2500 tons of ore mined daily at a quarry, o.4 percent results in a
certain pure metal. In how many days of mining will the total amount of
pure metal produced at the quarry be equal to the daily amount mined?
Ans 1000
28
A school administratior will assign each student in a group of n students
to one of m classroom. If 3<m<13<n, is it possile to assign each of the
n students to one of m classrooms so that each classroom has the same number of
students assigned to it.
1 It is possible to assign each of 3n students to one of m classrooms so that
each classroom has the same number of studnent assigned to it
2 It is possible to assign each of 13n students to one of m classrooms so that
each classroom has the same number of students assigned to it
Ans b
希望有人可以幫我一下
希望有好心人士可以幫我解惑 大感激
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※ 編輯: qqopqqop 來自: 59.115.116.56 (09/06 15:40)