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Bumek [7]
3 years ago
13

Suppose you are consulting for a bank that's concerned about fraud detection, and they come to you with the following problem. T

hey have a collection of n bank cards that they've confiscated, suspecting them of being used in fraud. Each bank card is a small plastic object, containing a magnetic stripe with some encrypted data, and it corresponds to a unique account in the bank. Each account can have many bank cards corresponding to it, and we'll say that two bank cards are equivalent is they correspond to the same account. It's very difficult to read the account number off a bank card directly, but the bank has a high-tech "equivalence tester" that takes two bank cards and, after performing some computations, determines whether they are equivalent. Their question is the following: among the collection of n cards, is there a set of more than n/2 of them that are all equivalent to one another? Assume that the only feasible operations you can do with the cards are to pick two of them and plug them in to the equivalence tester. Show how to decide the answer to their question with only O(n log n) invocations of the equivalence tester.
Computers and Technology
1 answer:
iren [92.7K]3 years ago
8 0

Answer:

Explanation:

( n cards are there initially )

we pick out the first card in random it takes n-1 comparisons to figure out

its Equivalence card - n-1 steps

Two cards have been eliminated ( this leaves us with 2 and n-2 cards)

we pick out the 2nd card in random it takes n-3 comparisons to figure out

its Equivalence card - n-3 steps

we continue to do this.. till all cards are exhausted ( leaves us with 2

and n-4 cards again)

the last comparison will

have

- n-(n-3)

the sum of all these steps - (n-1) + (n-3) + (n-5) + .........+

(n-(n-3))

if you draw this in the form of a tree.

n - n

2

n-2 - n

2

n-4 - n-2

2

n-6 - n-4

2

n-8 - n- 6

the height of the tree will be log n , sum @ each level is at most n

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Which is true about POP3 and IMAP for incoming email?
IceJOKER [234]
<h2>Answer:</h2>

Option A: Both POP3 and IMAP  keep email on an email server by default.

is the correct answer.

<h2>Explanation:</h2>

Following points will make the idea of POP3 and IMAP clear:

<h3>POP3:</h3>
  • POP3  is the acronym for Post Office Protocol 3.
  • POP3 is the method of receiving emails in which the emails received on the app can be downloaded on to the computer by having an internet connection.
  • These downloaded emails can be viewed offline whenever needed and managed as well.
  • POP3 makes it possible that the storage space of the default server do not run short as the downloaded emails are deleted from the server.
<h3>IMAP:</h3>
  • IMAP stands for Internet Message Access Protocol.
  • It is the method in which the mails are viewed and managed directly on the internet server instead of downloading them on the computer.
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<h3>Conclusion:</h3>

So from these points we can make sure that both ways keep emails on email server but POP3 have option to download mails from server while IMAP dont have.

<h2>I hope it will help you!</h2>
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