Mathematics

In a room filled with 7 people, 4 people have exactly 1 sibling in the room and 3 people have exactly 2 siblings in the room. If two individuals are selected from the room at random, what is the probability that those two individuals are not siblings?

Section-E: Mathematics (Qs. 22-26)

A man divided his share between his sons A and B in such a way that the interest received by A at 15% p.a. for 3 years is double the interest received by B at 12% p.a. for 5 years. In what ratio was his share divided?

Section-E: Mathematics (Qs. 22-26)

In the figure, ABCD is a parallelogram. What is the value of bº?

Section-E: Mathematics (Qs. 22-26)

Two trains 100 meters and 120 meters long are running in the same direction with spoeds of 72 km/hr and 54 km/hr. In how much time will the first train cross the second?

Section-E: Mathematics (Qs. 22-26)

The ages of Rima and Bina are in the ratio of 9:8. After 5 years, the ratio of their ages will be 10:9. What is the difference in their ages?

Section-E: Mathematics (Qs. 22-26)

If, $x+\frac{1}{x}=\sqrt{2}$ , , then what will be value of $x^4+\frac{1}{x^4} ?$