Arithmetic Sequences and nth term | Introduction | ExamSolutions

Arithmetic sequence and nth term.
This is a type of sequence which you need to recognise first before applying the correct formula to find the nth term. Watch to learn!
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Powaup You will know how many terms you are summing (n) so let L = n and use the nth term formula where d=1 so last term =A+(L-1)(1)

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Can u pls link the video which shows the proof of the sn formula

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We've now linked this in the description.

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can we use the formula, a(r)^n-1 to find the nth term ?

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do you have one on arithmetic sequences where its like find a value of n that exceeds....

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Question : how do you find the differene if you are given a1 and a3

[@ExamSolutions_Maths]

Easy, a2 = the mean of a1 and a3 so a2 = (a1 + a3) / 2. Then the difference will be a2-a1 or a3-a2

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if sum of nth terms is =3+3.5+3.25+.......+3.(5)n then what will be the term one less than n i mean 2nd last term?

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no. That is the nth term of a geometric progression

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what would be the formula if n is not given?

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arithmetic progression

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