A mixture of paint is prepared by mixing 2 parts of red pigments with 5 parts of the base. Using the given information in the following table, find the values of a, b and c to get the required mixture of paint.

1. a = 10, b = 10, c = 10

2. a = 5, b = 2, c = 5

3. a = 10, b = 5, c = 10

4. a = 10, b = 5, c = 15

The sum of money required to buy 50, ₹ 40 shares at ₹ 38.50 is :

1. ₹ 1920

2. ₹ 1924

3. ₹ 1925

4. ₹ 1952

The roots of quadratic equation x² - 1 = 0 are :

1. 0

2. 1

3. -1

4. ±1