15. Complete the A.P sequences

Riya, a teacher, instructed her students to stand in line with specific numbers, as shown in the below image. And she informed the remaining students to find the unknown number in the given \(A.P\) sequences.

Finish the sequences and complete the questionnaire.

 

 

i) 7108, 12, 161318, 20, 241529

 

ii) The first term \((a) =\)

 

iii) The common difference \((d) =\)