Question

Question 7 (ii)
In which of the following situations, do the lists of numbers involved form an AP? Give reasons for your answers.

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.

Answer 1

The fee charged every month by a school from I to XII is:
$250,(250+50),(250+2\times 50),(250+3\times 50),\dots$
$whichis,250,300,350,400,\dots$

These numbers form an AP, with common difference (d) = 300 – 250 = 50