For \(a, b, c\) to be in G.P. the value of \(\dfrac{a-b}{b-c}\) is equal to ____.
a/b or b/c
The sum of terms equidistant from the beginning and end in an A.P. is equal to ____.
First term + last term
The third term of a G.P. is 4, the product of the first five terms is ____.
45