| BACK Important Concepts: i)1. 'BODMAS' rule: This rule depicts the correct sequence in which the operations are to be executed, so as to find out the value of a given expression. 2. Here B stands for Bracket, O for Of, D for Division, M for Multiplication, A for Addition and S for Subtraction. 3. First of all the brackets must be removed, strictly in the order () , {} , []. 4.After removing the brackets, we want use the following operations: 1.Of 2. Division 3. Multiplication 4. Addition 5. Subtraction ii)Modulus of a real number: Modulus of a real number is a defined as |a| = a, if a>0 or -a, if a < 0; BACK |