A-Level Maths: D3-02 Sigma Notation: Writing a Series in Sigma Notation

[rosettegolda]

People have always recommended your videos and I've disregarded them for whatever reason. But watching this has made SO MUCH SENSE! I wish I'd been watching your videos since the start of year 12!

[reekova]

You've made it understandable for me.

[enosrusike]

Thank you now I understand these things they are so easy

[humanloll]

You're absolutely GOD SENT. Thanks a million for these videos!

[z_]

Hey, I was just wondering for the nth term of questions 3 and 4, do I have to write my answer in the form that you have given it or can I write the way I want, because another way to write the nth term for question 3 (for example) is Un= (-4/21)n+11/21

[abdirahmanahmed]

Do you need to know example 3, 4, 5 type sequences for edexcel alevel? I thought it was only geometric or arithmetic