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virtus Group Title

question below

  • 2 years ago
  • 2 years ago

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  1. virtus Group Title
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    \[nC4 + nC5\]

    • 2 years ago
  2. akash123 Group Title
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    use d formula for n c r and do d simplification

    • 2 years ago
  3. akash123 Group Title
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    nCr= n!/ r! (n-r)!

    • 2 years ago
  4. virtus Group Title
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    is it ok if you show me, kinda new to this

    • 2 years ago
  5. akash123 Group Title
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    n!/ 4! (n-4)! + n!/ 5! (n-5)!

    • 2 years ago
  6. akash123 Group Title
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    n(n-1)(n-2)(n-3)/24 + n(n-1)(n-2)(n-3)(n-4)/ 120

    • 2 years ago
  7. akash123 Group Title
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    it's ok?

    • 2 years ago
  8. virtus Group Title
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    i still can't see it

    • 2 years ago
  9. akash123 Group Title
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    see... n!= 1.2.3.4....n

    • 2 years ago
  10. akash123 Group Title
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    right?

    • 2 years ago
  11. virtus Group Title
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    yes

    • 2 years ago
  12. akash123 Group Title
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    n!/ (n-4)! = 1.2.3....(n-4)(n-3)(n-2)(n-1)n / (1.2.3....(n-4))

    • 2 years ago
  13. virtus Group Title
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    yeah...

    • 2 years ago
  14. akash123 Group Title
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    so now u can solve ur problem....:)

    • 2 years ago
  15. virtus Group Title
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    let me try

    • 2 years ago
  16. virtus Group Title
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    n(n-1)(n-2)(n-3)/24 + n(n-1)(n-2)(n-3)(n-4)/ 120

    • 2 years ago
  17. virtus Group Title
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    i got that, but how do you simplify further?

    • 2 years ago
  18. virtus Group Title
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    LOL @hba looks like you have no choice but to help this damsel in distress

    • 2 years ago
  19. hba Group Title
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    @virtus i dont think so lol

    • 2 years ago
  20. virtus Group Title
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    16Cn +16C9 =17C9

    • 2 years ago
  21. virtus Group Title
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    FIND "n"

    • 2 years ago
  22. virtus Group Title
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    why not @hba

    • 2 years ago
  23. hba Group Title
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    Its been along time ive studied it and i dont want to get you into another confusion :(

    • 2 years ago
  24. virtus Group Title
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    OH LOL ok then

    • 2 years ago
  25. akash123 Group Title
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    16Cn +16C9 =17C9 16Cn+16C9=16C9 + 16C8 16Cn=16C8 n=8

    • 2 years ago
  26. akash123 Group Title
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    use the identity nCr + nC(r-1) = (n+1)Cr

    • 2 years ago
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