My f key sticks and doesn't press down like the rest of the keys . It does type but I'm not sure why it won't press down. It?

My f key sticks and doesn't press down like the rest of the keys . It does type but I'm not sure why it won't press down. It?
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Description : Find the false statement: (A) In Modern Cryptography, symmetric key algorithms use same key both for Encryption and Decryption. (B) The Symmetric cipher DES (Data Encryption Standard) was widely used ... and 124 bits. (D) Public key algorithms use two different keys for Encryption and Decryption.

Last Answer : (C) The AES (Advanced Encryption Standard) cryptosystem allows variable key lengths of size 56 bits and 124 bits.

If h is chosen from a universal collection of hash functions and is used to hash n keys into a table of size m, where n ≤ m, the expected number of collisions involving a particular key K is (A) less than 1 (B) less than lg n (C) greater than 1 (D) greater than lg n

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Last Answer : (A) less than 1

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Last Answer : (C) N(N-1)/2 

Consider the following database table having A, B, C and D as its four attributes and four possible candidate keys (I, II, III and IV) for this table: Image I: {B} II: {B, C} III: {A, D} IV: {C, D} If different symbols stand for different values in the table (e.g., d1 is definitely not equal to d2), then which of the above could not be the candidate key for the database table? (A) I and III only (B) III and IV only (C) II only (D) I only

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If h is chosen from a universal collection of hash functions and is used to hash n keys into a table of size m, where n≤m, the expected number of collisions involving a particular key x is less than ................... (1) 1 (2) 1/n (3) 1/m (4) n/m

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Last Answer : Answer: 1

Which of the following statement is true? (1) A Primary key is also a candidate key (2) Each relation has at least one foreign key (3) Foreign keys can’t have null values (4) A Primary key is also an alternate key

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Out of a man's mouth it comes forth, lightening hearts and inspiring souls to be steadfast. Tales of old it tells, of warriors and kings, of castles and dungeons. It tells of sunshine and hills, flowers and grass. Of food and drink it encourages you to press on, of fantasies it gives you rest and delight. It carries on through ages and never an ending does it find. What is it? -Riddles

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