Question

Find the 7th term from the end of the AP: 7,10,13,....,184.

Answer 1

Solution:-

Given : a = 7, d = 10 - 7 = 3, Last term = 184
So, 
a₇ from the end
L - (n - 1)d
184 - (6d)
184 - (6*3)
184 - 18
= 166
So, 7th term from the end is 166
Answer.

Answer 2

Answer:

Step-by-step explanation:

Solution :-

Let us write A.P in reverse order

i.e 184, ........... 13, 10, 7.

d = 7 - 10 = - 3

a = 184

n = 7

⇒ a₇ = a + 6d

⇒ a₇ = 184 + 6 (- 3)

⇒ a ₇ = 184 - 18

⇒ a₇ = 166

Hence, 166 is the 7th term from the end.