Question

Exercise 9.2
1. Find the AP whose nth term is 7- 3. Also find the 20th term​

Answer 1

Your answer is --

Given,

Tn = 7 - 3n

So,

T1 = 7 - 3×1 = 4

T2 = 7 - 3×2 = 1

T3 = 7 - 3×3 = -2

So, the required AP is :-

4 , 1 , -2 ..........

Such that , first term a = 4 and common difference d = 1-4 = -3

Therefore ,

T20 = a + 19d

= 4 + 19 × -3

= 4 - 57

= -53