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Arithmetic Progressions

Question
CBSEENMA10007966
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 Write the common difference of an A .P. whose nth term is 3n + 5. 

Solution

We have, an = 3n + 5
a1 = 3(1) + 5 = 3 + 5 = 8
a2 = 3 (2) + 5 = 6 + 5 = 11
And, a3 = 3 (3) + 5 = 9 + 5 = 14
Now, common difference = a2 – a1 = 11 – 8 = 3.

Some More Questions From Arithmetic Progressions Chapter

Write first four terms of the AP, when the first term a and the common difference d are given as follows:
a – 10, d = 10

Write first four terms of the AP, when the first term a and the common difference d are given as follows:
a = –2, d = 0

Write first four terms of the AP, when the first term a and the common difference d are given as follows:
a = 4, d = – 3

Write first four terms of the AP, when the first term a and the common difference d are given as follows:

a = – 1.25, d = – 0.25

For the following APs, write the first term and the common difference
3, 1, – 1, – 3, . . .

For the following APs, write the first term and the common difference
– 5, – 1, 3, 7, . . .

For the following APs, write the first term and the common difference
0.6, 1.7, 2.8, 3.9, . . .

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