In a geometric sequence, the product of the third and seventh terms is 64 and the common ratio is 2.
Find the possible values of the first term.
[4]
Question 2
Skill question
The first three terms of a geometric sequence are a, ab, and 2ab. Express the common ratio r and determine any condition on b.
[3]
Question 3
Skill question
(No specification provided)
The first three terms of a geometric sequence are 5, k, and 20. Determine all possible values of k.
[2]
Question 4
Skill question
Consider two geometric sequences un and vn. The sequence un has a first term of 2 and common ratio r1. The sequence vn has a first term of 3 and common ratio r2.
Given that u3=v3, r2=r11 and r1>0, find the exact value of r1.
[4]
Question 5
Skill question
In a geometric sequence, the first term is 8x and the common ratio is 21.
If the fifth term equals 41, find the value of x.
[3]
Question 6
Skill question
In a geometric sequence, u2+u5=45 and the common ratio is 2.