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Arithmetic Progressions

Question
CBSEENMA10007862
Wired Faculty App

In an A.P. 
Given l = 28, S = 144, n = 9, find ‘a’.


Solution

Here, l = 28, S = 144
n = 9
l = a + (n – 1)d
28 = a + (9 – 1)d
⇒ 28 = a + 8d ...(i)
And,
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rightwards double arrow space space space space space space 288 over 9 equals 2 left parenthesis straight a space plus space 4 straight d right parenthesis
rightwards double arrow    32 = 2(a + 4d)
rightwards double arrow    a + 4d = 16                                  .....(ii)
Solving (i) and (ii) we get,
      a = = 32 -28 = 4
Hence ,    a   =  4

Some More Questions From Arithmetic Progressions Chapter

In which of the following situational, does the list of numbers involved make an arithmetic progression, and why?

The taxi fare after each km when the fare is Rs. 15 for the first km and Rs. 8 for each additional km.

In which of the following situational, does the list of numbers involved make an arithmetic progression, and why?

The cost of digging a well for the first metre is Rs. 150 and rises by Rs. 50 for each succeeding metre.

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, . . .

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