Question 1194958: 2, 4 , 6, 8 , Explicit formula?
2, 6, 18, 54, Explicit formula?
3, 6, 12, 24, Explicit formula?
2, 3, 4.5, 6.75 Explicit formula?
Answer by MathLover1(20850) (Show Source):
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1. , , , ,
here we need the formula for nth term of an arithmetic progression is
note that the difference between terms is
In this example we have and
where = , , ,...
2. , , , ,
here we need the formula for nth term of a geometric progression which is

where = , , ,...
3. , , , ,
this is also a geometric progression
where = , , ,...
4.
, , ,
rewrite sequence as , , ,
this is also a geometric progression

where = , , ,...
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