Let X be the set of all persons living in Delhi. The persons a an b in X are said to be related, if the difference in their ages is almost 5 hr. The relation is

If A = {x$$\in$$ R : x² + 6x $$-$$ 7 < 0} and B = {x$$\in$$ R : x² + 9x + 14 < 0}, then which of the following is/are correct?

1. (A $$\cap$$ B) = ($$-$$2, 1)

2. (A $$-$$ B) = ($$-$$7, $$-$$2)

Select the correct answer using the code given below

A, B, C and D are four sets such that A $$\cap$$ B = C $$\cap$$ D = $$\phi$$.

Consider the following

1. A $$\cup$$ C and B $$\cup$$ D are always disjoint.

2. A $$\cap$$ and B $$\cap$$ D are always disjoint.

Which of the above statements is/are correct?

In an examination, 70% students passed in Physics, 80% students passed in Chemistry, 75% students passed in Mathematics and 85% students passed in Biology, and x% students failed in all the four subjects. What is the minimum value of x?