Tuesday

March 31, 2015

March 31, 2015

Posted by **Miley** on Friday, December 27, 2013 at 4:08pm.

f(n)= (n-1). if n is even;

f(n)= (2n). if n is odd.

If k ∈ N, and f (f (f(k))) = 21, find the sum of the digits in k

I really don't get this means. (∈)

- Math -
**Damon**, Friday, December 27, 2013 at 5:07pm"is an element of "

see:

http://www.glenoaks.edu/facultystaff/FacultyWebSites/JillToner/Documents/NSM105%20-%20Math%20for%20El%20Ed/Section%202.1%20-%20Set%20Theory.pdf

- Math -
**Damon**, Friday, December 27, 2013 at 5:26pmf [ f ( f(k) ) ] = 21

f ( f(k) ) = 22

f(k) = 11

k = 12

- Math -
**Damon**, Friday, December 27, 2013 at 5:27pmso about two digits in twelve

**Answer this Question**

**Related Questions**

discrete math - Prove by contradiction that for any even integer a and any odd ...

discrete math - prove that if n is an integer and 3n+2 is even, then n is even ...

Algebra - The sum of two consecutive odd integers is 56. A. Define a variable ...

math - A. Four times one odd integer is 14 less than three times the next even ...

Math - What is the answer here? Find the sum of the biggest odd numbers formed ...

Probability - Consider three random variables X, Y, and Z, associated with the ...

math - the sum of an even integer and twice the next greater even integer is the...

Geometry - CounterExamples and Inductive Reasoning and Conjectures? Make a ...

math - I am thinking of a two-digit number in which the sum of the digits is 9 ...

Math - You can only use the digits 0-9. I need an odd number that is a multiple ...