The 7th term of an A.P. is 4 and its common difference is −4. The first term of the A.P. is :

1. 32

2. 28

3. 24

4. 36

The sum of first n terms of an A.P. is (4n² + 2n). The nth term of the A.P. is :

1. (6n − 2)

2. (8n − 2)

3. (6n + 2)

4. (8n + 2)

There are total 9 terms in an A.P. If the last term and the sum of all the terms are 28 and 144 respectively, then the first term is :

1. 1

2. 7

3. 4

4. 5

The 5th term of an A.P. is −3 and its common difference is −4. The sum of its first 10 terms is :

1. −50

2. −40

3. −60

4. −30