The organizers of the concert arranged 390 chairs in a row so that there were 18 chairs in the first row and 42 chairs in the last row, and the number of chairs in the rows forms an arithmetic progression. How many chairs were placed in rows, and how many chairs in each subsequent row are more than the previous one?

4

Step-by-step explanation:

introduction, methodology, results, discussion

step-by-step explanation:

an observational study is one which consists of actual observation to record data and then analyse the data.

there are a number of factors that should be analyzed before starting an observational study.

the main four factors are:

i) introduction:   this should be analysed to check whether the purpose of the study is correctly established and the data recorded are appropriate for the study

methodology:   the method of collecting the data, such as whether randomly selected, and whether sample size matches with the population to be studied, whether questions asked are easy to answer by common men, etc.

results: then results such as summary of data with comments should be studied thoroughly

discussion:   the last is the discussion, this can be either by management people or persons who are all interested , etc.

i am unable to solve this problem

step-by-step explanation: