The following image shows 4 boxes containing different balls labelled by numbers between 1 and 9. The boxes are used in a lottery to determine a winning combination of 4 numbers by drawing one ball from each box. To enter the lottery, participants write 4 numbers between 1 and 9 on their ticket in nondecreasing order (from smallest to largest). A ticket wins if all its numbers are drawn in the lottery. The order in which the numbers are drawn does not matter. For example, if the drawing is (5, 5, 1, 7), then a ticket with the numbers (1, 5, 5, 7) wins (the numbers are the same, albeit in a different order), but a ticket with the numbers (1, 5, 6, 7) loses. Construct a list of all valid tickets, i.e., all tickets that can potentially be drawn in the lottery, and store it in the variable possible_tickets. The tickets should be specified as tuples of 4 numbers in nondecreasing order, and every valid ticket should appear exactly one time in the list possible_tickets. (Note, however, that some numbers may occur more than once on a single ticket, as in the above example.)

The following image shows 4 boxes containing different balls labelled by numbers between 1 and 9. The boxes are used in a lottery to determine a winning combination of 4 numbers by drawing one ball from each box. To enter the lottery, participants write 4 numbers between 1 and 9 on their ticket in nondecreasing order (from smallest to largest). A ticket wins if all its numbers are drawn in the lottery. The order in which the numbers are drawn does not matter. For example, if the drawing is (5, 5, 1, 7), then a ticket with the numbers (1, 5, 5, 7) wins (the numbers are the same, albeit in a different order), but a ticket with the numbers (1, 5, 6, 7) loses. Construct a list of all valid tickets, i.e., all tickets that can potentially be drawn in the lottery, and store it in the variable possible_tickets. The tickets should be specified as tuples of 4 numbers in nondecreasing order, and every valid ticket should appear exactly one time in the list possible_tickets. (Note, however, that some numbers may occur more than once on a single ticket, as in the above example.)

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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