Question

The number −11, −7, −3, 1, 5, ... are
(a) in AP with d = −18
(b) in AP with d = −14
(c) in AP with d = −4
(d) not in AP

Answer 1

(c) in AP with d = 4

In the given progression, [-7 - (-11)] = [-3 - (-7)] = [1 -(-3)] = 4 (constant)
Thus, each term differs from its preceding term by 4.
So, the given progression is an AP with d = 4.