Question

which one is irrational
1. root 4/9
2.4/5
3. root 7
4. root 81

Answer 1

option 3 is irrational number.. √7
because it has non terminating non repeating decimal expansion while others have either terminating or repeating...

Answer 2

Here, we have,.
1. root 4/9 = 2/3.
2. 4/5.
3. Root 7.
4. Root 81 = 9.

Thus, we can clearly conclude that root 7 is a iirational number.

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