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Pattern brain teaser

  1. Apr 13, 2005 #1
    if
    1*2=2*1
    2*3=2*1+2*2
    3*4=2*1+2*2+2*3
    4*5=2*1+2*2+2*3+2*4

    then
    3*1+3*2+3*3+3*4=???
     
  2. jcsd
  3. Apr 13, 2005 #2
    Answer is whited out:

    2 * (1 + 2 + 3 + 4 + 5)
     
  4. Apr 14, 2005 #3
    umm. i'm sorry but i guess i suppose to rephrase the question,
    ???=3*1+3*2+3*3+3*4

    in form of
    1*2
    2*3
    and
    3*4
     
  5. Apr 14, 2005 #4
    Answer whited out:

    5 * 6
     
  6. Apr 17, 2005 #5
    ???=3*1
    ???=3*1+3*2
    ???=3*1+3*2+3*3
    ???=3*1+3*2+3*3+3*4
    ???=3*1+3*2+3*3+3*4+3*5
     
  7. Apr 22, 2005 #6
    1*3
    3*3
    3*6
    5*6
    5*9
    7*9
    7*12
    9*12
    etc - Good one
     
  8. Apr 22, 2005 #7
    at, that's what i am looking for
     
    Last edited: Apr 22, 2005
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