Which of the following statements are rightly associated with the laws of weight in the theory of errors?

1. If an equation is multiplied by its own weight, then the weight of the resulting equation is equal to the reciprocal of the weight of the original equation.

2. The weight of the algebraic sum of two or more quantities is equal to the reciprocal of the sum of the individual weights.

3. If the quantity of a given weight is multiplied with a factor, then the weight of the resulting  quantity is obtained by dividing the original weight by the square root of that factor.

4. If the quantity of a given weight is divided by a factor, then weight of the resulting quantity is obtained by multiplying the original weight by the square of that factor.