Geometric Series - Proof of the Sum of the first n terms : ExamSolutions

[marcofplus]

Never knew snape taught C2...

[kamraman123]

thank you!

[iYateszy]

wow thanks

[Vupadhayay]

Thanxz alot the video give very nice and simple explanation.

I have 1 simple question may be it sound senseless but i have been always wondering WHY WE NEED TO MULTIPLY OUR SERIES WITH r to get the another series and WHY WE ARE SUBTRACTING Sn with rSn???

[ExamSolutions]

@Vupadhayay So that we can eliminate many of the the terms. It's a clever technique.

[SaronArul]

THIS HELPOED MEE SOO MUCH THANK YOU :D x

[ExamSolutions]

@SaronArul Good to hear - thanks

[AyeOldSponge]

THANKS SIR!!!!!!!!!!!!!!

[gautamv8]

wonderful explanation thank you!

[ExamSolutions]

@gautamv8 Thanks

[priya753]

4:55 I HOPE SO XXX

[MrRyanification]

Is this the only proof you need to know at C2?

[ExamSolutions]

@MrRyanification As far as I am aware.

[xkate1019x]

Thanks so much :)

[KSaiyu]

Thanks for this, Edexcel book doesn't even bother trying to explain how the proof comes about.

[ExamSolutions]

@KSaiyu That's ok

[sheepkilier]

This explains so much better than Wiki

lol.

[COLDKILER15]

Thank you so much!

[AKCharlie47]

ExamSolutions, your amazing.

[TheBoatThatrocks94]

i love you , great explanation

[stripesfreak]

Thank you so much I could never get from the multiplication by r to the final equation! Exam tomorrow I hope this comes up now!

[ExamSolutions]

@stripesfreak Hope it does for your sake - Best wishes

[DelltaAce]

Thank you! Resitting a resit tomorrow and finally get this! Going in confident now! :D

[ExamSolutions]

@DelltaAce I hope it comes up now for you. Good luck.

[S1D3W1ND3R101]

I wish you were my maths teacher! Mine is useless :L

[WWHysterical]

Thank you again! Clear and to the point! Phew!

[JustCut08]

THANKS SO MUCH.

[ExamSolutions]

No probs - pleased to hear that it helped.

[tjheslin]

lol just learnt this today.

[iMileyHannah]

I learnt this today! He's really good isnt he?