Question

Write first four terms of the A.P. when the first term a and the common difference d are given as follows:

(i) a = 10, d = 10
(ii) a = -2, d = 0
(iii) a = 4, d = – 3


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Answer 1

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(i) a = 10, d = 10

Let us consider, the Arithmetic Progression series be a1, a2, a3, a4, a5 …

a1 = a = 10

a2 = a1 + d = 10 + 10 = 20

a3 = a2 + d = 20 + 10 = 30

a4 = a3 + d = 30 + 10 = 40

a5 = a4 + d = 40 + 10 = 50

And so on…

Therefore, the A.P. series will be 10, 20, 30, 40, 50 …

And First four terms of this A.P. will be 10, 20, 30, and 40.

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(ii) a = – 2, d = 0

Let us consider, the Arithmetic Progression series be a1, a2, a3, a4, a5 …

a1 = a = -2

a2 = a1 + d = – 2 + 0 = – 2

a3 = a2 + d = – 2 + 0 = – 2

a4 = a3 + d = – 2 + 0 = – 2

Therefore, the A.P. series will be – 2, – 2, – 2, – 2 …

And, First four terms of this A.P. will be – 2, – 2, – 2 and – 2.

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(iii) a = 4, d = – 3

Let us consider, the Arithmetic Progression series be a1, a2, a3, a4, a5 …

a1 = a = 4

a2 = a1 + d = 4 – 3 = 1

a3 = a2 + d = 1 – 3 = – 2

a4 = a3 + d = – 2 – 3 = – 5

Therefore, the A.P. series will be 4, 1,- 2, – 5 …

And, the first four terms of this A.P. will be 4, 1, – 2 and – 5.

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Answer 2

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