## 1. How many terms are there in 20, 25, 30......... 140

## 2. Find the first term of an AP whose 8^{th} and 12^{th} terms are respectively 39 and 59.

^{th}and 12

^{th}terms are respectively 39 and 59.

## 3. Find the 15^{th} term of the sequence 20, 15, 10 . . . . .

^{th}term of the sequence 20, 15, 10 . . . . .

## 4. The sum of the first 16 terms of an AP whose first term and third term are 5 and 15 respectively is

## 5. How many terms are there in the GP 5, 20, 80, 320........... 20480?

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