Evaluating a series of factorials

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  • Опубліковано 19 жов 2024
  • In this video, I showed how to evaluate a finite series of factorials using knowledge of sequences and series.

КОМЕНТАРІ • 38

  • @Crk-ot6um
    @Crk-ot6um 4 місяці тому +10

    What a coincidence! I too used the telescopic series and the idea of general term to solve this. At last I also got 1/2! - 1/2024!, this seemed not good to me as I felt it may be a vague answer but anyway, I continued with your video. I'm happy at last that I got one of the answers to be right after solving many of the questions from your thumbnail and video!

  • @emmanuelonah4596
    @emmanuelonah4596 4 місяці тому +2

    It's beautiful to see how the telescoping series saved the day. Thank you, you are an amazing teacher

  • @djez8
    @djez8 4 місяці тому +3

    Thank you from Hong-Kong (but I am french...)! Your explanations are always clear and accuratr, I enjoy every time!

  • @dougaugustine4075
    @dougaugustine4075 4 місяці тому +5

    I'm going to have to watch this again. Summations with the signa notation were always a puzzle for me as was probability with permutations and combinations.

  • @SanePerson1
    @SanePerson1 Місяць тому +2

    An interesting aside: the general term of the related INFINITE series looks very similar to the general term for the Maclaurin series for e¹ - the difference is the "k+2" in the denominator. A way to get that in the denominator is to multiply the series for e^x by x: x + x²/1! + x³/2! + x⁴/3! + ... Integrate that term by term one gets the series you have here with x = 1 and an extra term in front of 1/2 that comes one term in front of x²/2. To sum the series then you can integrate xe^x from 0 to 1 and subtract 1/2; the series sum is 1 so you get 1/2 for the sum of the infinite series - as it should since the limit of the tiny correction is 0 when you let 2024 → ∞.

  • @slavinojunepri7648
    @slavinojunepri7648 2 місяці тому +1

    Excellent solution!

  • @komalshah1535
    @komalshah1535 4 місяці тому +3

    Telescoping series. Very interesting. Thanks.

  • @Coder-ff8iw
    @Coder-ff8iw 4 місяці тому

    Excellent sir❤ . I appreciate your approach. Your teaching method is so easy that we can understand very easily

  • @alexandrecuchi2400
    @alexandrecuchi2400 4 місяці тому +1

    Never see telecoping series. But I would whatch a video about them. Greate work

  • @Vabadrish
    @Vabadrish 4 місяці тому

    Wow got it in first try !! Thank you sir for such beautiful questions ....love your videos ❤

  • @violet_broregarde
    @violet_broregarde 2 місяці тому

    Thank you for this problem, it was very fun to solve :D

  • @nothingbutmathproofs7150
    @nothingbutmathproofs7150 3 місяці тому

    Beautiful!

  • @AzmiTabish
    @AzmiTabish 4 місяці тому +1

    Awesome. Thanks.

  • @dirklutz2818
    @dirklutz2818 4 місяці тому

    Great idea!

  • @Harrykesh630
    @Harrykesh630 4 місяці тому +2

    Telescopic series ✨

  • @Antagon666
    @Antagon666 20 днів тому

    Didn't know what I was looking at... Written it as sum 1/((n+2)n!) and guessed 1/2 from first 4 terms, which is hella close, considering I don't do maths very often

  • @Necrozene
    @Necrozene 4 місяці тому

    Oh! I get it now! Yay! Go Prime Newtons!

  • @surendrakverma555
    @surendrakverma555 4 місяці тому

    Good 👍

  • @epikherolol8189
    @epikherolol8189 4 місяці тому +4

    12:40 That's scary😈

  • @study_math
    @study_math 4 місяці тому

    面白い~😄

  • @ayushsingh3174
    @ayushsingh3174 4 місяці тому +1

    Nice problem

  • @77Chester77
    @77Chester77 4 місяці тому +1

    Got a new hat? Looks great 😀

    • @PrimeNewtons
      @PrimeNewtons  4 місяці тому

      Not new. Just not frequently worn compared to others .

    • @Jon60987
      @Jon60987 4 місяці тому

      @@PrimeNewtons You missed the chance to showcase your hat by posing so that the summation sign that you put in the forefront of the screen would be perfectly aligned on the top part of your hat. I also like that hat, and it is good enough to get a brief 5 seconds when it is the star of the show :)

    • @PrimeNewtons
      @PrimeNewtons  4 місяці тому

      @@Jon60987 🤣🤣🤣🤣🤣

  • @Necrozene
    @Necrozene 4 місяці тому

    I am currently struggling to figure out why P.N. did not do the formula from 1 and then subtract of the easy bits at the start...

  • @artandata
    @artandata Місяць тому

    answer is: 1/2 - 1,5479244899×10⁻⁵⁸¹⁵ just a little very little bit less than 0.5 😄

  • @griffinf8469
    @griffinf8469 4 місяці тому

    I’m confused about the 5:47 to 6:20 minute mark. How do you go from (k+1)! to (k+1)k! and how do you go from (k+2)! to (k+2)(k+1)k!? Can someone explain the steps in doing that?

    • @griffinf8469
      @griffinf8469 4 місяці тому +1

      Nevermind, I figured it out.

  • @mab9316
    @mab9316 Місяць тому

    This series converges to 1/2.

  • @quigonkenny
    @quigonkenny 4 місяці тому

    "...a very small number..."
    Yep. Unless you're looking for an answer with over 5800 significant digits, the answer is 0.5...

  • @ivanhuertas5307
    @ivanhuertas5307 4 місяці тому

    Thanks brother you are just amazing!! ..one question speaking about "series" on the "Soul-Series" what are your believes..do you believe in the Lord JesusChrist?

  • @carlosfox8201
    @carlosfox8201 4 місяці тому

    Double beauty

  • @0llie
    @0llie 4 місяці тому

    next video: calculate 2024! manually 😂

  • @Necrozene
    @Necrozene 4 місяці тому

    Simple. Just whip out your calculator. lol NO! I want to see how Prime Newtons does it.

  • @lucasborges6447
    @lucasborges6447 4 місяці тому +1

    Esplendido.