13(a) Consider the alphabet Σ = {a, 3, 7,6}. Answer the following two questions. You must justify your answers, and not simply state numerical values. (i) How many strings of length 5 defined over Σ contain exactly one a and exactly one 3? (ii) How many strings of length 5 defined over Σ contain exactly two y's and at least one d?

13(a) Consider the alphabet Σ = {a, 3, 7,6}. Answer the following two questions. You must justify your answers, and not simply state numerical values. (i) How many strings of length 5 defined over Σ contain exactly one a and exactly one 3? (ii) How many strings of length 5 defined over Σ contain exactly two y's and at least one d?

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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