A1 A2 Arithmetic Progression With Common Difference Then Evaluate Following Expression

If a1,a2,a3,…,an is an arithmetic progression with common difference d, then evaluate the following expression.

Answers:

Since a1,a2,a3,…,an is an arithmetic progression with common difference d
d = a2 -a1 = a3-a2 = a4 – a3 = ……. = an – an-1