Answer:
a progression is a summation of quantities based upon a sequence.
Explanation:
example of a progression
1,4,7,10,13,16,.........
a1=1
a2=4
a3=7
difference =d=a2-aq=4-1=3
similarly
d=a3-a2=7-4=3
we can clearly see that there is a difference of 3 between two consecutive terms of a progression
on the other hand successive terms of a progression can be obtained by adding a unique value in backward term to get successive term.
hence a progression is a summation of quantities based upon a sequence