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Omniscience

  • 2 years ago

If a random selection is made from 1,2,3,4,5,6 where the digits cannot be repeated, find the probability that the number selected is greater than 4500

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  1. apple_pi
    • 2 years ago
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    how many numbers are selected? 4?

  2. Omniscience
    • 2 years ago
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    yeah 4 digits; i forgot to mention that sorry

  3. apple_pi
    • 2 years ago
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    well if > 4500, there are two cases: 1: first number = 4, second = 5 2: first number > 4

  4. Omniscience
    • 2 years ago
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    isnt the first case 4,5 ,6?

  5. Ishaan94
    • 2 years ago
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    2C1*6P4 + 2C1*5P2?

  6. Omniscience
    • 2 years ago
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    nope

  7. Ishaan94
    • 2 years ago
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    Are you sure?

  8. Omniscience
    • 2 years ago
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    yes itcant be that high lol the probability is 2/5 and from what you got is 14440/360

  9. Omniscience
    • 2 years ago
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    wait from what you got is 760/360; still not right

  10. IsraelYkb
    • 2 years ago
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    (12*6)/(6*5*4*3)

  11. IsraelYkb
    • 2 years ago
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    mine 72/360.

  12. Omniscience
    • 2 years ago
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    i got that as well; still not right

  13. Ishaan94
    • 2 years ago
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    I am sorry. I blew it :( First Case. When first digit is greater than 4 i.e {5,6}. 2C1*(5*4*3) Second Case. When first digit is 4, and second is 5. 4*3

  14. IsraelYkb
    • 2 years ago
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    @Omniscience 2/5 is not right?

  15. Omniscience
    • 2 years ago
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    72/360 = 1/5 still not right..

  16. Ishaan94
    • 2 years ago
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    Second Case should be 2*4*3 as the second could be 6 also. I believe I have got the answer.

  17. Ishaan94
    • 2 years ago
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    ... second digit* could be ...

  18. Omniscience
    • 2 years ago
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    yes ishaan got it. thanks

  19. RadEn
    • 2 years ago
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    all case : |dw:1347236931812:dw|

  20. IsraelYkb
    • 2 years ago
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    |dw:1347266631816:dw|

  21. IsraelYkb
    • 2 years ago
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    2*(12)+120

  22. IsraelYkb
    • 2 years ago
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    I GOT IT!!!!!!!!!!!!!!!!

  23. IsraelYkb
    • 2 years ago
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    144 ways out of 360

  24. RadEn
    • 2 years ago
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    why, 2*12?

  25. IsraelYkb
    • 2 years ago
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    oh....|dw:1347267287282:dw| that's why

  26. IsraelYkb
    • 2 years ago
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    that's 1*2*4*3 same as 2*12

  27. RadEn
    • 2 years ago
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    oh, yea... i am forget that |4|6|...|...| should can be selected ... lol thanks @IsraelYkb

  28. IsraelYkb
    • 2 years ago
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    and using 5 and 6 it's very easy it's just 2*5*4*3

  29. RadEn
    • 2 years ago
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    yea, that's i know...

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