55. Exemplar exercise problem XV

In which of the following situations, do the lists of numbers involved form an AP? Give reasons for your answers.

1. The fee charged from a student every month by a school for the whole session, when the monthly fee is \(₹400\). A.P.Not an A.P.

 

2. The fee charged every month by a school from Classes I to XII, when the monthly fee for Class I is \(₹250\), and it increases by \(₹50\) for the next higher class. A.P.Not an A.P.