Arithmetic sequences and series
Set the first term, common difference and number of terms to see each term and the sum.
Learn arithmetic sequences properly
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Questions students ask
How do you find the nth term of a linear sequence?
The common difference d is the number in front of n; then adjust: for 3, 7, 11, … d = 4 and the nth term is 4n − 1.
What formula does it use?
uₙ = a + (n − 1)d; Sₙ = n/2 × (2a + (n − 1)d).
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