Sequences & Series (Edexcel A-Level Mathematics): Quizzes

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For un=7n+n2u_n = 7n + n^2, what is u3u_3?

3030

What is a sequence?

A list of numbers

What is the common difference in an arithmetic sequence?

Constant difference between terms

What is the common ratio in a geometric sequence?

Constant factor between terms

What is a series?

The sum of terms of a sequence

In Sn=n2(2a+(n1)d)S_n = \frac{n}{2}(2a + (n-1)d), what does dd represent?

Common difference

When does the infinite geometric series formula S=a1rS = \frac{a}{1-r} apply?

When r<1|r| < 1

What does i=14i\sum_{i=1}^{4} i equal?

1010

What defines a convergent series?

Sum approaches a finite value

Which series is divergent?

1+2+3+4+...1 + 2 + 3 + 4 + ...

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