The 7th term of an A.P. is −1 and its 16th term is 17. The nth term of the A.P. is :

1. (3n + 12)

2. (2n − 5)

3. (3n + 5)

4. (2n − 15)

If the sum of first p terms of an A.P. is ap² + bp, then its common difference is :

1. a

2. 3a + b

3. a + b

4. 2a

The first three terms of an A.P. are 3y − 1, 3y + 5 and 5y + 1 respectively. Then, the value of y is :

1. 1

2. 5

3. 8

4. 3

The 8th term from the end of the A.P. 7, 10, 13, …, 184 is:

1. 157

2. 160

3. 163

4. 166