Ex 5.1, 2
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
First term = a = 10
Common difference = d = 10
Second term = First term + Common difference
= 10 + 10
= 20
Third term = Second term + Common difference
= 20 + 10
= 30
Fourth term = Third term + Common difference
= 30 + 10
= 40
Hence, first four terms of AP are
10, 20, 30, 40 ……
Ex 5.1, 2
Write first four terms of the A.P. when the first term a and the common difference d are given as follows
(ii) a = −2, d = 0
First term = a = –2
Common difference = d = 0
Second term = First term + Common difference
= –2 + 0
= –2
Third term = Second term + Common difference
= –2 + 0
= –2
Fourth term = Third term + Common difference
= –2 + 0
= –2
Hence , first four term of AP are
– 2, –2, –2, – 2
Ex 5.1, 2
Write first four terms of the A.P. when the first term a and the common difference d are given as follows
(iii) a = 4, d = −3
First term = a = 4
Common difference = –3
Second term = First term + Common difference
= 4 + (–3)
= 4 – 3
= 1
Third term = Second term + Common difference
= 1 + (–3)
= 1 – 3
= –2
Fourth term = third term + common difference
= −2 + (–3)
= –2 – 3
= –5
Hence, first 4 terms of AP are
4, 1, –2, –5
Ex 5.1, 2
Write first four terms of the A.P. when the first term a and the common difference d are given as follows
(iv) a = − 1 d = 1/2
First term = a = –1
Common difference = d = 1/2
Second term = First term + common difference
= – 1 + 1/2
= (−2 + 1)/2
= (−𝟏)/𝟐
Third term = Second term + common difference
= (−1)/2 + 1/2
= 0
Fourth term = third term + common difference
= 0 + 1/2
= (0 + 1)/2
= 𝟏/𝟐
Hence first four terms of AP are
–1, (−𝟏)/𝟐 , 0, 𝟏/𝟐
Ex 5.1, 2
Write first four terms of the A.P. when the first term a and the common difference d are given as follows
(v) a = −1.25, d = −0.25
First term = a = –1.25
Common difference = d = –0.25
Second term = first term + common difference
= –1.25 + (–0.25)
= –1.25 – 0.25
= –1.50
Third term = second term + common difference
= –1.50 + (–0.25)
= –1.50 – 0.25
= –1.75
Fourth term = third term + common difference
= –1.75 + (–0.25)
= –1.75 – 0.25
= –2.00
Hence first 4 terms of AP are
–1.25, –1.50, –1.75, –2.00

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.

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