Answer:
Service record is the record that is used to track the record of service of the employ in an organization.
Explanation:
The idea behind the service record is to maintain the whole detail of record of the person during his employment including, personnel information, record related to his promotions and posting, salary record etc.
Answer:
A unique identifier for a wireless subscriber
Answer And explanation
a)
has 1/ probability guess the correct source
b)
Each element in 
is mapped by / . There are 
So there are -1 elements.
number of target elements =
number of source elements = -1
probability = -1 /
c) Probability of the correct target element
1/
