0. Holy digits Batman! The Riddler is planning his next caper somewhere on Pennsylvania Avenue. In his usual sporting fashion, he has left the address in the form of a puzzle. The address on Pennsylvania is a four-digit number where: • All four digits are different · The digit in the thousands place is three times the digit in the tens place • The number is odd • The sum of the digits is 27

0. Holy digits Batman! The Riddler is planning his next caper somewhere on Pennsylvania Avenue. In his usual sporting fashion, he has left the address in the form of a puzzle. The address on Pennsylvania is a four-digit number where: • All four digits are different · The digit in the thousands place is three times the digit in the tens place • The number is odd • The sum of the digits is 27

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Credit card numbers follow certain patterns: It must have between 13 and 16 digits, and the number must start with:■ 4 for Visa cards■ 5 for MasterCard credit cards■ 37 for American Express cards■ 6 for Discover cards In 1954, Hans Luhn of IBM proposed an algorithm for validating credit card numbers. The algorithm is useful to determine whether a card number is entered correctly or whether a credit card is scanned correctly by a scanner. Credit card numbers are generated following this validity check, commonly known as the Luhn check or the Mod 10 check, which can be described as follows (for illustration, consider the card number 4388576018402626): 1. Double every second digit from right to left. If doubling of a digit results in a two-digit number, add up the two digits to get a single-digit number. 2. Now add all single-digit numbers from Step 1. 3. Add all digits in the odd places from right to left in the card number. 4. Sum the results from Steps 2 and 3. 5. If the result from…
Fibonacci numbers are the numbers in a sequence in which the first three elements are 0, 1, and 1, and the value of each subsequent element is the sum of the previous three elements: 0,1,1,2,4,7,13,24...
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Artificial Intelligence (Part - 1) ==================== The Towers of Hanoi is a famous problem for studying recursion in computer science and searching in artificial intelligence. We start with N discs of varying sizes on a peg (stacked in order according to size), and two empty pegs. We are allowed to move a disc from one peg to another, but we are never allowed to move a larger disc on top of a smaller disc. The goal is to move all the discs to the rightmost peg (see figure). To solve the problem by using search methods, we need first formulate the problem. Supposing there are K pegs and N disk. (1) Propose a state representation for the problem?
The "e" number is an important constant real number in mathematics and engineering science.It's definition of natural logarithm and also an irrational number.Approximate value is e=2.718281828459045235360287471352662497757247.....In the following equation which discovered by Harlan A. Brothers and John A. Knox, the greater the number "x", the result approximates the actual number "e".((2x+1)/(2x-1))^x Code a "C" program to calculate the approximate value of "e" by increasing the value of "x" (x=1, x=2, x=3...)Let the value of "x" continue to increase (if the difference is bigger) until the difference between the results from the equations and value 2.718281 is less than 0.000001.When the difference is less than 0.000001, project the x value at that moment and the result obtained from the equation on the screen.
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