Define a function f: Z* to Z* by the rule: for each integer n, f(n) = the sum of the positive divisors of n. This function is O None of the choices onto only one-to-one only neither one-to-one nor onto one-to-one and onto

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
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Answer the 2 questions, will upvote if complete, short solution/explanation will do
pls do not reject. thanks

Define a function f: Z* to Z* by the rule: for each integer n, f(n) = the sum of the positive divisors of n. This function is
O None of the choices
O onto only
O one-to-one only
O neither one-to-one nor onto
one-to-one and onto
Transcribed Image Text:Define a function f: Z* to Z* by the rule: for each integer n, f(n) = the sum of the positive divisors of n. This function is O None of the choices O onto only O one-to-one only O neither one-to-one nor onto one-to-one and onto
Given year n, the first day of the year (Jan. 1) is given by the ff,. formula:
1
n-1
n-1
n+
тod 7
4
100
400
where:
Sunday = 0, Monday = 1, ., Saturday = 6
Determine the day of the week for January 1, 1111?
Sunday
Saturday
O Tuesday
Friday
O Monday
Wednesday
Thursday
Transcribed Image Text:Given year n, the first day of the year (Jan. 1) is given by the ff,. formula: 1 n-1 n-1 n+ тod 7 4 100 400 where: Sunday = 0, Monday = 1, ., Saturday = 6 Determine the day of the week for January 1, 1111? Sunday Saturday O Tuesday Friday O Monday Wednesday Thursday
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