The 7th term of the given Arithmetic Progression (A.P.):

$\dfrac{1}{a}, \Big(\dfrac{1}{a} + 1\Big), \Big(\dfrac{1}{a} + 2\Big), ……$ is :

1. $\Big(\dfrac{1}{a} + 6\Big)$

2. $\Big(\dfrac{1}{a} + 7\Big)$

3. $\Big(\dfrac{1}{a} + 8\Big)$

4. $\Big(\dfrac{1}{a} + 7^7\Big)$

The nth term from the end of an A.P., whose first term, last term and common difference are a, l and d respectively, is given by:

1. l + (n + 1)d

2. l − (n − 1)d

3. l + (n − 1)d

4. l − (n + 1)d

The sum of first 50 natural numbers is:

1. 1050

2. 1175

3. 1225

4. 1275

The nth term of an Arithmetic Progression (A.P.) is 2n + 5. The 10th term is :

1. 7

2. 15

3. 25

4. 45