Consider the alphabet E = {0, 1, 2, 7,9, F, G, H, J, L, M, P, R,T,V,W,Y}. Answer the following questions this alphabet. Note: This problem will accept formulas and the functions P(n, k) and C(n, k) in the answers. • How many 4 character strings that only contain letters are there? • How many 6 character strings do not contain duplicate characters? • How many 5 element subsets of E are there? etters2

Consider the alphabet E = {0, 1, 2, 7,9, F, G, H, J, L, M, P, R,T,V,W,Y}. Answer the following questions this alphabet. Note: This problem will accept formulas and the functions P(n, k) and C(n, k) in the answers. • How many 4 character strings that only contain letters are there? • How many 6 character strings do not contain duplicate characters? • How many 5 element subsets of E are there? etters2

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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The Fibonacci sequence begins with 0 and then 1 follows. All subsequent values are the sum of the previous two, for example: 0, 1, 1, 2, 3, 5, 8, 13. Complete the fibonacci() function, which takes in an index, n, and returns the nth value in the sequence. Any negative index values should return -1 Ex: If the input is: 7 the output is: fibonacci (7) is l3 Note: Use recursion and DO NOT use any loops.
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