Question 10
The first three terms of a sequence are 2, x, 8. Find the postive value of x so that the sequence is
a) An arithmetic progression
b) A geometric progression
Question 11
The first three terms of an arithmetic progression are 5, 9, 12. Find
a) The common difference of the progression
b) The sum of the first 20 terms after the 3rd term
Question 12
The sum of the first n term of the geometric progression 8, 24, 72 … is 8744. Find
a) The common ration of the progression
b) The value of n
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