All about flooble | fun stuff | Get a free chatterbox | Free JavaScript | Avatars    
perplexus dot info

Home > Logic
Ady's RH problem (Posted on 2014-03-11) Difficulty: 4 of 5

Sequence1= (all existing 4-digit numbers, no leading zeros);
Sequence2= (each member of seq1 replaced by 1 iff fulfilling both conditions : cond1 and cond2; replaced by 0 otherwise.)

Cond1: k (the number of letters in the English set of words representing N) is even.
For example the number 3024 (three thousand twenty four) does not qualify (23 letters) .

Cond2: the number N is evenly divisible by 3, e.g. the number 3024 qualifies.

Ergo: 3024 of Sequence1 will be replaced by 0 in Sequence2.

Denote by N1 the number of ones in the seq2 and by N0 the number of zeroes in that sequence.

Don't be intimidated by the D4 label,- reread the text carefully and try to answer all of the following questions:

a. What does the RH stand for?
b. Is it true that abs(N1- N0) is an even number?
c. What is the meaning of KISS?
d. Why D4?

  Submitted by Ady TZIDON    
No Rating
Solution: (Hide)
a. Red Herring.
e. Yes. Since N1+N0=9000 abs(N1- N0) is always even.
c. KISS= Keep It Simple, Stupid.
d. One spends significant time to find out that no time is actually needed!

Comments: ( You must be logged in to post comments.)
  Subject Author Date
re: RHAdy TZIDON2014-03-12 01:39:55
Some ThoughtsRHSteve Herman2014-03-11 18:51:30
Solutionre(2): Half-serious answertomarken2014-03-11 17:08:33
for the curious on the question not askedCharlie2014-03-11 17:01:47
Hints/Tipsre: Half-serious answerAdy TZIDON2014-03-11 16:04:46
SolutionHalf-serious answertomarken2014-03-11 15:25:35
Please log in:
Remember me:
Sign up! | Forgot password

Search body:
Forums (2)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (2)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Copyright © 2002 - 2020 by Animus Pactum Consulting. All rights reserved. Privacy Information