Apps. and Interpretation for IBDP Maths Ebook 1 | Page 65

Exercise 17
1. In an arithmetic sequence, u1 � 27 and u5 �� 1.
(a) Find d .
(b) Find u
25
.
(c) Find S
25
.
[2]
[2]
[2]
2. In an arithmetic sequence, u1 � 3.5 and u7 � 6.5 .
(a) Find d .
(b) Find u
42
.
(c) Find S
84
.
3. In an arithmetic sequence, the second term is 0 and the tenth term is 24.
[2]
[2]
[2]
7
(a)
(b)
(c)
Find the common difference.
Find the fourth term.
Find the sum of the first ten terms of the sequence.
[2]
[2]
[2]
4. In an arithmetic sequence, the third term is
2
� and the eighth term is
3
22
� .
3
(a)
(b)
(c)
Find the common difference.
Find the eleventh term.
Find the sum of the first forty terms of the sequence.
[2]
[2]
[3]
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