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• Duckster789 534 Posts

  Wed, Aug 23 2017 8:37 PM

  9

• mkg335 5,491 Posts

  Wed, Aug 23 2017 8:57 PM

  3 = 6

• Duckster789 534 Posts

  Wed, Aug 23 2017 10:00 PM

  My brain hurts!

   

   

• phred952 2,714 Posts

  Wed, Aug 23 2017 10:32 PM

  mkg335:

  3 = 6

  I agree Mark.  Well done figuring out the regression factor and avoiding the obvious trap left in the sequence.

  Jeff

• drmoose 3,542 Posts

  Thu, Aug 24 2017 4:05 AM

  Yep, I'm on board with 3 = 6 , which would follow the gap left by 4 =12. Do we have to show our work ?

  Doc :)

• YankeeJim 25,827 Posts

  Thu, Aug 24 2017 5:09 AM

  IDK about making assumptions about the missing 4, that 6 looks pretty good BUT there could be a solid  argument made for 9 or 12.

  The multiplier on the first column reduces by 1 each line to end with 3 x 3 OR the subtrahend in the second column is even numbers working backwards to end with 20 - 8.

• gonfission 2,246 Posts

  Thu, Aug 24 2017 5:41 AM

  drmoose:

  . Do we have to show our work ?

  Mornin , no, that's why the video is here.

  Well done Mark, & all

   

• YankeeJim 25,827 Posts

  Thu, Aug 24 2017 5:58 AM

  The answer is based on an assumption that there should be a line 4. There isn't in the problem. Where do you draw that assumption line when solving math problems?

• mkg335 5,491 Posts

  Thu, Aug 24 2017 6:19 AM

  YJ, I guess it's an if/then proposition.  If all the other statements are true, then the statement for 3 must be true...a case where math and logic intersect.