Question

in 7root5,7/root5,77,pi-2 rational no. is

a.7/root 5
b.pi- 2
c. 77
d.7root5

and how???​

Answer 1

Answer:

(c) 77

Step-by-step explanation:

Becoz

1. 7/root 5

when we rationalise it we will get

7 root 5 / 5 which is an irrational number.

Hence this can not be the rational number.

2. pi-2

As we already know that pi is an irrational number.

Hence this can also not be the rational number.

3. 77

77 can be represent in the form of p/q i.e. 77/1 where p nd q both are integers.

Hence it is a rational numbers.

4. 7 root 5

when we rationalise it we will get

7 root 5 / 5 which is an irrational number.

Hence this is also not a rational number.

From the data, we get to know that (c) 77 is a rational number whereas all other 3 options are irrational.