The (n)th term of an AP is given by (tₙ = a ⋅ bⁿ). Show that it is an AP. Find its first term and common difference.
a) (a, b², b³, ...)
b) (a, b, b², ...)
c) (a, ab, ab², ...)
d) (a, b, 2b, 3b, ...)