Derangement : Summation formula proof: Dn=n!(1-1/1!+1/2!-1/3!+...+(-1)^n/n!)

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  2. Dn=n!(1-1/1! 1/2!-1/3! ... (-1)^n/n!)
  3. Derangement
  4. Recursive
  5. relation
  6. prove
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Mathsmerizing
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Thanks a lot sir spent about an hour to understand this from a book and you brought down all the agitation and resolved just in 6 minutes.

heetkotak
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Great! The proof for this formula is as soothing as the music in the background!

aritraray
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best explanation!! completely clear and to the point, and far better than the IIT Ropar video

aniketroy
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You made it so easy and understandable

editor_real
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sir the lecture was amazing but i think you should not keep any tune in the background.

wickedi
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Very helpful for me sir... thank you so much

SIGNUMMATHEMATICS
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Hello sir, Have you studied engineering or mathematics at your university level. Sir actually people have a misconception that only Engineers could teach for JEE. I myself am a BSc Math student.I just wanted to know to get ur inspiring example which I can give to people when they challange mathematics graduates.

markatmani
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great explanation, but plz remove the background music

keshavbansal
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2:55 Sir how did we go from first step of D(n) to second?

abhayphotos
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In the step in the reds, why is the end term (-1)^n-1 and not (-1)^n . Aren't there a total of n terms in the bracket?

nitikagambhir
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The video is great! But can you please remove the background music. It overlaps a lot with you voice.

nuhanoor
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Changes notations from a1, a2, a3 to aI, aJ….

Confusing

TheScott