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04 Nov 2023, 12:05
Kudos
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To comply with laws regarding the use of personally identifiable information, a certain company must adopt a new way of determining its customer identification numbers (CIDs) in its customer records database. Proposals are being considered on the basis of the following principles:
• Database Constraints: Each character in each CID must be from the following table:
• Error Checking: There must be some mechanism for determining if a CID could be valid without checking the database.
• Meaningful: Each CD must reflect some information about the customer to which it is assigned.
Whichever proposal is adopted, the new CIDs will be issued to all former customers currently in the database.
• Database Constraints: Each character in each CID must be from the following table:
• Error Checking: There must be some mechanism for determining if a CID could be valid without checking the database.
• Meaningful: Each CD must reflect some information about the customer to which it is assigned.
Whichever proposal is adopted, the new CIDs will be issued to all former customers currently in the database.
The customer's email was str@example.com.: Could not be true
The customer began shopping at 10:39 in the evening on the day before the first purchase.: Could be true
The customer's first purchase was made 16 seconds after 1:29:00 in the morning.: Could not be true
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
85%
(hard)
Question Stats:
37% (03:04) correct
63%
(03:18)
wrong
based on 2155
sessions
History
Date
Time
Result
Not Attempted Yet
1. Suppose that Proposal 2 has been adopted and that a customer has been issued a CID of 1039str0129016. For each of the following statements about this customer, select Could be true if, in light of the given information, the statement could be true. Otherwise, select Could not be true.
| Could be true | Could not be true | |
| The customer's email was str@example.com. | ||
| The customer began shopping at 10:39 in the evening on the day before the first purchase. | ||
| The customer's first purchase was made 16 seconds after 1:29:00 in the morning. |
ShowHide Answer
Official Answer
The customer's email was str@example.com.: Could not be true
The customer began shopping at 10:39 in the evening on the day before the first purchase.: Could be true
The customer's first purchase was made 16 seconds after 1:29:00 in the morning.: Could not be true
Database Constraints: Explicitly mentioned
in Proposal 1 Error Checking: Not explicitly mentioned
in Proposal 1 Meaningful: Explicitly mentioned
in Proposal 1
in Proposal 1 Error Checking: Not explicitly mentioned
in Proposal 1 Meaningful: Explicitly mentioned
in Proposal 1
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
83% (00:51) correct
17%
(01:00)
wrong
based on 1499
sessions
History
Date
Time
Result
Not Attempted Yet
2. For each of the following principles named in the Customer Identifiers tab, select Explicitly mentioned in Proposal I if that principle is explicitly mentioned in the description of Proposal 1. Otherwise, select Not explicitly mentioned in Proposal 1.
|
Explicitly mentioned in Proposal 1 |
Not explicitly mentioned in Proposal 1 |
|
| Database Constraints | ||
| Error Checking | ||
| Meaningful |
ShowHide Answer
Official Answer
Database Constraints: Explicitly mentioned
in Proposal 1 Error Checking: Not explicitly mentioned
in Proposal 1 Meaningful: Explicitly mentioned
in Proposal 1
in Proposal 1 Error Checking: Not explicitly mentioned
in Proposal 1 Meaningful: Explicitly mentioned
in Proposal 1
32,768
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
95%
(hard)
Question Stats:
50% (02:11) correct
50%
(02:06)
wrong
based on 1470
sessions
History
Date
Time
Result
Not Attempted Yet
3. How many 3-character alphanumeric sequences can appear as the 5th, 6th, and 7th characters of a valid CID under Proposal 2?
| 1,000 | |
| 10,648 | |
| 17,576 | |
| 32,768 | |
| 46,656 |
ShowHide Answer
Official Answer
32,768
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08 Nov 2023, 05:10
Kudos
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1. Suppose that Proposal 2 has been adopted and that a customer has been issued a CID of 1039str0129016.
For each of the following statements about this customer, select Could be true if, in light of the given information, the statement could be true. Otherwise, select Could not be true.
We are looking at COULD be true, so if the statement can be clearly shown as not possible, the answer would be TRUE.
The customer's email was str@example.com. - As per the Proposal 2, the letters s, t, r, a, i, o, u change, so str cannot remain as str.
Could NOT be true
The customer began shopping at 10:39 in the evening on the day before the first purchase. - As per the proposal 1 and 2, the timing of first purchase is given, so she could have begun shopping anytime before that.
Could be true
The customer's first purchase was made 16 seconds after 1:29:00 in the morning. - As per the proposal 1 and 2, the timing of first purchase is given by 012901 in 1039str0129016, so she did her first purchase at 1:29:01, that is 01 second after 1:29:00 in the morning.
Could NOT be true
2. For each of the following principles named in the Customer Identifiers tab, select Explicitly mentioned in Proposal I if that principle is explicitly mentioned in the description of Proposal 1. Otherwise, select Not explicitly mentioned in Proposal 1.
It can be easily seen from
Database Constraints - explicitly mentioned in Proposal 1
Error Checking - Not explicitly mentioned in Proposal 1
Meaningful - explicitly mentioned in Proposal 1
3. How many 3-character alphanumeric sequences can appear as the 5th, 6th, and 7th characters of a valid CID under Proposal 2?
the three characters being spoken about are the three letters/numeric values of e-mail
Under Proposal 1, these can be any of the 26 letters and 10 digits.
Under Proposal 2, we have s, t and r interchanged and all of remaining 4 vowels(a, i, o, u) other than e, changing to e. So, we now can have these as any of the 26-4 letters and 10 digits. Thus, each place can be filled in 32 ways..
Total Ways = 32*32*32 = 32768
For each of the following statements about this customer, select Could be true if, in light of the given information, the statement could be true. Otherwise, select Could not be true.
We are looking at COULD be true, so if the statement can be clearly shown as not possible, the answer would be TRUE.
The customer's email was str@example.com. - As per the Proposal 2, the letters s, t, r, a, i, o, u change, so str cannot remain as str.
Could NOT be true
The customer began shopping at 10:39 in the evening on the day before the first purchase. - As per the proposal 1 and 2, the timing of first purchase is given, so she could have begun shopping anytime before that.
Could be true
The customer's first purchase was made 16 seconds after 1:29:00 in the morning. - As per the proposal 1 and 2, the timing of first purchase is given by 012901 in 1039str0129016, so she did her first purchase at 1:29:01, that is 01 second after 1:29:00 in the morning.
Could NOT be true
2. For each of the following principles named in the Customer Identifiers tab, select Explicitly mentioned in Proposal I if that principle is explicitly mentioned in the description of Proposal 1. Otherwise, select Not explicitly mentioned in Proposal 1.
It can be easily seen from
Quote:
Database Constraints - explicitly mentioned in Proposal 1
Error Checking - Not explicitly mentioned in Proposal 1
Meaningful - explicitly mentioned in Proposal 1
3. How many 3-character alphanumeric sequences can appear as the 5th, 6th, and 7th characters of a valid CID under Proposal 2?
the three characters being spoken about are the three letters/numeric values of e-mail
Under Proposal 1, these can be any of the 26 letters and 10 digits.
Under Proposal 2, we have s, t and r interchanged and all of remaining 4 vowels(a, i, o, u) other than e, changing to e. So, we now can have these as any of the 26-4 letters and 10 digits. Thus, each place can be filled in 32 ways..
Total Ways = 32*32*32 = 32768
08 Nov 2023, 01:29
Kudos
Bookmarks
3rd question solution.
The below is my calculation:
First, without any conditions, each possible value of 5th, 6th, and 7th could be 26 (alphabets) + 10 (numbers) =36 characters.
However, from the transformation form on the third tab, we must minus [a i o u] from the possible characters, since they are all transformed to [e].
We can finally get that 26-4 (alphabets) + 10 (numbers) = 32 (characters).
Since there's no limitation of redundancy, we can calculate it as 32*32*32=32,768.
The below is my calculation:
First, without any conditions, each possible value of 5th, 6th, and 7th could be 26 (alphabets) + 10 (numbers) =36 characters.
However, from the transformation form on the third tab, we must minus [a i o u] from the possible characters, since they are all transformed to [e].
We can finally get that 26-4 (alphabets) + 10 (numbers) = 32 (characters).
Since there's no limitation of redundancy, we can calculate it as 32*32*32=32,768.
