Test: Arithmetic and Geometric Series - Ambitious

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Question 1:   Specify the formula for the arithmetic progression
a n = a 1 +d×(n1)
a n = a 1 +d×n
a n =2× a 1 +d×(n1)
a n = a 1 +n
Question 2:   Find the twenty-first arithmetic term of the following arithmetic series   1,1.5,2,...
12
10.5
10
11
Question 3:   Find the common ratio of geometric progression if the first element is   2  ,  and the fifth   1250 .
2
10
25
5
Question 4:   Find the sum of the first hundred members of the arithmetic progression if the first element is   3   and the difference is   5 .
25050
25000
25005
50100
Question 5:   In geometric progression we have:   b 1 =2 ,   q=0.5 .  Calculate the sum of the first 3 members of the progression.
2.5
3.75
3.5
4
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