## 6. The first three terms of an A.P. respectively are 3y – 1, 3y + 5 and 5y + 1. Then, y equals

## 7. If 7^{th} and 13^{th} terms of an A.P. be 34 and 64 respectively, then its 18^{th} term is

^{th}and 13

^{th}terms of an A.P. be 34 and 64 respectively, then its 18

^{th}term is

## 8. If the sum of it terms of an A.P. is 2n^{2} + 5n, then its nth term is

^{2}+ 5n, then its nth term is

## 9. If the sum of first n even natural number is equal to k times the sum of first n odd natural numbers, then k =

## 10. In an AP, S_{p} = q, S_{q} = p and S denotes the sum of first r terms. Then, S_{p+q} is equal to

_{p}= q, S

_{q}= p and S denotes the sum of first r terms. Then, S

_{p+q}is equal to

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