Jump to content

Ask me a question

13, 15, 17, __ , 21, 23, what’s the missing number in the sequence?

Topic Summary

Created

Last Reply

Replies

Views

JW Insider -
3
40

Top Posters


Recommended Posts


Quote

13, 15, 17, __ , 21, 23, what’s the missing number in the sequence?

Of course, this could be part of a sequence that goes

7, 9, __ 13, 15, 17, __ , 21, 23, 25, __ , 29, __ , 33, etc., in which case no number is missing in that portion of the sequence. (In this case it would have been a series of incrementing odd numbers from 7 where we skip odd numbers that match the prime status of the previous number.)

It's for a similar reasons that pattern recognition in AI should never be considered "set in stone" but should only be given a probability. The probability was very high that the missing number was 19, but this should be subject to change on discovery of further information.

Another example happens all the time to engineers. If you happen to sample the amplitude of a 400 Hz sine wave at time increments of once per second you could get a sequence of 0, 0, 0, 0 ... etc. If you think it's a mistake and sample it 200 times a second you could still get 7, 7, 7, 7, etc., or 0, 0, 0, 0, etc., depending on when the wave starts its peaks and troughs. But you could sample it at some odd number of increments, or accelerate and decelerate the time sampling increments and discover it is a 400 Hz sine wave. 

Share this post


Link to post
Share on other sites

Join the conversation

You are posting as a guest. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   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...





×
×
  • Create New...

Important Information

Terms of Service Confirmation Terms of Use Privacy Policy Guidelines We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.