## 21. What is the sum of the first 12 terms of an arithmetic progression if the first term is -19 and last term is 36?

## 22. The 3^{rd} and 7^{th} term of an arithmetic progression are -9 and 11 respectively. What is the 15^{th} term?

^{rd}and 7

^{th}term of an arithmetic progression are -9 and 11 respectively. What is the 15

^{th}term?

## 23. What is the sum of the first 12 terms of an arithmetic progression if the 3^{rd} term is -13 and the 6^{th} term is -4?

^{rd}term is -13 and the 6

^{th}term is -4?

## 24. If the 3^{rd} and the 5^{th} term of an arithmetic progression are 13 and 21, what is the 13^{th} term?

^{rd}and the 5

^{th}term of an arithmetic progression are 13 and 21, what is the 13

^{th}term?

## 25. The 3^{rd} and 6^{th} term of an arithmetic progression are 13 and -5 respectively. What is the 11^{th} term?

^{rd}and 6

^{th}term of an arithmetic progression are 13 and -5 respectively. What is the 11

^{th}term?

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