(a) Find the common difference of an A. P. whose first term is 5 and the number of terms is 30 and sum 1455. (b) Find the common difference of an A. P. whose first term is 9, the number of terms is 7, and the sum is 0.

it's a optional mathematics Questions please solve him​

answer: all the values are within because it has a pattern that repeats from -6 to 4.

good luck!

step-by-step explanation:

this is not possible to solve with the info given.   you need at least an one angle somewhere.

if you are saying purchasing 3 social media ads and one newspaper ad counts as one purchase then there are:

6 purchases

if you are asking how many of each then:

18 social media ads

6 newspaper ads