Topic 3

Question 1

What is the equation for the nth term of an arithmetic sequence

Answer 1

Uₙ = a + (n-1)d

Question 2

What is the equation for the sum of an arithmetic sequence (in formula book)

Answer 2

Sₙ=1/2 n(2a+ (n-1) d)

Question 3

What is the equation for the nth term of a geometric sequence

Answer 3

Uₙ=ar^(n-1)

Question 4

What is the equation for the sum of a geometric sequence (in formula book)

Answer 4

Sₙ = a(1-r^n)/1-r

Question 5

What is the equation for the sum of a geometric sequence to infinity

Answer 5

S∞ = a/1-r

Question 6

What is a periodic sequence of order x

Answer 6

A sequence that repeats itself every x number of terms