Jump to content
BrainDen.com - Brain Teasers
  • 0

Difficult Sequences


rocdocmac
 Share

Question

Replace the ? in each of these sequences with the correct value ...

[1]  1  4  17  54  145  368  945  ?

[2]  0  6  21  405  -504  ?

[3]  2  15  10001  215441  ?

[4]  7  8  5  3  9  8  1  6  3  ? 

[5] 15  52  99  144  175  180  147  ?

[6]  0  5  8  8  2  3  5  2  9  4  ?

[7]  1   2r    πr²   / πr3  ?   

[8]  4/10  ?/102 168/103  1229/104  9592/105  78498/106

[9]  3  23  229  2869  43531  ?

[10]  14  21  13  2  5  8  0  19  5  18  9  5  ?

[11]  6  8  5  8  4  0  7  3  4  6  ?

[12]  1  3  8  22  65  209  732  2780  ?

Edited by rocdocmac
No title!
Link to comment
Share on other sites

5 answers to this question

Recommended Posts

  • 0
21 hours ago, rocdocmac said:

Replace the ? in each of these sequences with the correct value ...

  1.   1  4  17  54  145  368  945  ?
  2.   0  6  21  405  -504  ?
  3.   2  15  10001  215441  ?
  4.   7  8  5  3  9  8  1  6  3  ? 
  5.   15  52  99  144  175  180  147  ?
  6.   0  5  8  8  2  3  5  2  9  4  ?
  7.   1   2r    πr²   / πr3 1/2 π²r4    { Can be written: r0  2r1  πr2  4/3 πr3  1/2 π²r4 ... }
  8.   4/10  ?/102 168/103  1229/104  9592/105  78498/106
  9.   3  23  229  2869  43531  ?
  10.   14  21  13  2  5  8  0  19  5  18  9  5  ?
  11.   6  8  5  8  4  0  7  3  4  6  ?
  12.   1  3  8  22  65  209  732  2780  ?

 

Link to comment
Share on other sites

  • 0
12 hours ago, rocdocmac said:
  Reveal hidden contents

 

Spoiler

More precisely, volumes enclosed by nD spheres, or of nD balls.

Still, I'm wondering about the first term. Does it imply the volume enclosed by a point is 1? Should the first term be 0 r0 ?

 

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Answer this question...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
 Share

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...