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artofspeed

  • 2 years ago

hard probability question.. help plz?

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  1. artofspeed
    • 2 years ago
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  2. artofspeed
    • 2 years ago
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    I dunno :S

  3. kevinkeegan
    • 2 years ago
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    \[4^{4} = 256\]

  4. kevinkeegan
    • 2 years ago
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    want me to explain?

  5. shivam_bhalla
    • 2 years ago
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    @kevinkeegan Please do

  6. kevinkeegan
    • 2 years ago
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    okay you have 4 choices tiles to use WWW WWB WBWetc... each will take up 3 slots and you have 10 slots only so we use 3 diff groups( groups as in WWW= 1grp, WBW=1grp an so on) first, taking up 9 slots, so the probability of arranging the 3 grps = 4X4X4 ; now we left with 1 last slot for the single white tile; and we can put the white tiles @ 4 different places( trying drawing out): so that gives us extra 4 different combos and therefore, total probability= 4X4X4X4

  7. kevinkeegan
    • 2 years ago
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    |dw:1335113090901:dw| arrow point to last slot for single white tile

  8. ParthKohli
    • 2 years ago
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    I know the answer. http://ptri1.tripod.com/ptreal1r.gif See this picture of a pascal's triangle. Now see the row 2 and sum all the numbers of row 2 You get 4! See the row 10 and get the sum of all the numbers in row 10. You get the answer!

  9. kevinkeegan
    • 2 years ago
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    one thing to note: question did not state if the tiles can be reused, if cannot reuse, answer is 4X3X2X4

  10. ParthKohli
    • 2 years ago
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    Answer is 1024

  11. artofspeed
    • 2 years ago
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    what about Parthkohli's way ?

  12. kevinkeegan
    • 2 years ago
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    pascal triangle does not work here becasue the tiles are in groups of 3

  13. ParthKohli
    • 2 years ago
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    The question is about 10*1

  14. kevinkeegan
    • 2 years ago
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    pls read the question again

  15. ParthKohli
    • 2 years ago
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    The final line, see it.

  16. kevinkeegan
    • 2 years ago
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    is they want us to use the 4 combo of WWW WWB WBW BWW then im right

  17. kevinkeegan
    • 2 years ago
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    if*

  18. shivam_bhalla
    • 2 years ago
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    Somebody please explain the question. It is confusing

  19. kevinkeegan
    • 2 years ago
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    they want u to use the combos to fill up the 10 slots

  20. ParthKohli
    • 2 years ago
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    They're asking us the different colour patterns in a ten by one rectangle. There are 1024 such patterns. Try it on your own.

  21. ParthKohli
    • 2 years ago
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    They're asking us about the number of patterns possible in this case.

  22. kevinkeegan
    • 2 years ago
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    last line : "using THESE TILES " and i suppose THESE TILES refer to the 4 different colour patterns

  23. kevinkeegan
    • 2 years ago
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    the tiles are not individual they come in sets

  24. ParthKohli
    • 2 years ago
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    All right. You're right, I'm wrong. Okay?

  25. kevinkeegan
    • 2 years ago
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    |dw:1335113911913:dw|

  26. artofspeed
    • 2 years ago
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    @kevinkeegan, 'these tiles' actually refer to the 3 tiles in the picture

  27. kevinkeegan
    • 2 years ago
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    yep and the 3 tiles form the 4 colour patterns they giv WWW WBW BWW WWB

  28. PaxPolaris
    • 2 years ago
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    305. http://openstudy.com/updates/4f943f7de4b000ae9eca7fbc

  29. niki
    • 2 years ago
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    hey i think the ans is 385 plz check

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