The printed price of an article is ₹ 3080. If the rate of GST is 10% then the GST charged is :

1. ₹ 154

2. ₹ 308

3. ₹ 30.80

4. ₹ 15.40

(1 + sin A)(1 - sin A) is equal to :

1. cosec² A

2. sin² A

3. sec² A

4. cos² A

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

1. 7

2. 15

3. 25

4. 45

The mean proportional between 4 and 9 is :

1. 4

2. 6

3. 9

4. 36