Question

In a city there are 50 squares
(including dead ends). Among these
squares, m squares are there each
of which is adjacent to odd number
of roads. Then which of the following
is impossible for the value of m ?​

Answer 1

The options are

1. 10

2. 2

3. 0

4. 15

Given,

In a city, there are 50 squares  (including dead ends).

Since it's given that, m squares are there each of which is adjacent to an odd number of roads.  

In the given options only 15 is an odd number.

15 is impossible for the value of m.

Therefore, option 4 is correct.