__Example__:

Tickets for a certain show were printed bearing numbers from to . Odd number tickets were sold by receiving cents equal to thrice of the number on the ticket while even number tickets were issued by receiving cents equal to twice of the number on the ticket. How much amount was received by the issuing agency?

__Solution__:

Let and be the amounts received for odd number and even number ticket respectively, then

and

Thus,

There are terms in each series

Hence the total amount received by the issuing agency cents

__Example__:

A clock strikes once when its hour hand is at , twice when it is at and so on. How many times does the clock strike in six hours?

__Solution__:

Since the clock strikes once when its hour hand is at , twice when it is at and so on, so the sequence of strikes from hour to hours is .

Here , , so

This shows that the clock strikes times inhours.

__Example__:

A factory owner repays his loan of by in the first monthly installment and then increases the payment by in every installment. In how many installments he will clear his loan?

__Solution__:

By the given conditions, we have

, ,