Instructions

Note:In the following 20 questions ,each questionis followed bydata in the formof two statements labeled as I and II. You must decide whether the data given in the statements are sufficient to answer the questions. Using the data make an appropriate choice from (a) to (d) as per the following guidelines:

Question 18

What is the value of $$\frac{a^4 - b^4}{a^2b^2}$$?
I. $$a + b = 4$$
II. $$a - b = 2$$


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