Q20 of 178 Page 526

Find the 8th term from the end of the AP 7, 10, 13, ..., 184.

Here, First term = a = 7

Common difference = d = 10 - 7 = 3

Last term = l = 184

To find: 8^th term from end.

So, n^th term from end is given by:

a_n = l - (n - 1)d

∴ 8^th term from end is:

a₈ = 184 - (8 - 1) × 3

= 184 - 21

= 163

Find the middle term of the AP 10, 7, 4, ..., (-62).

Find the sum of two middle most terms of the AP

Find the 6th term from the end of the AP 17, 14, 11, ..., (-40).

Is 184 a term of the AP 3, 7, 11, 15, ...?