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# 1. In an arithmetic sequence, u1

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(1)

IB Questionbank Maths SL 1

1

3

(2)

20

(2)

20

### .

(2) (Total 6 marks)

1

20

n

(3)

### (b) Find the value of n.

(2) (Total 5 marks)

(1)

(3)

### (c) Find the sum of the sequence.

(2) (Total 6 marks)

1

2

3

27

1

(2)

n

n

### .

(4) (Total 6 marks)

(2)

IB Questionbank Maths SL 2

th

n = 5 + 2n.

(1)

th

### (ii) For this value of n, find the sum of the sequence.

(5) (Total 6 marks)

101

(3)

n

### = 152.

(3) (Total 6 marks)

n

1

2

3

(3)

20

1

n

n

### .

(3) (Total 6 marks)

(4)

### (b) Calculate the total number of seats.

(2) (Total 6 marks)

n

(1)

20

1

n

n

100

21

n

n

### .

(5) (Total 6 marks)

Cytaty

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