1. I did not understand example 1

Dear Student

The explanation of example 1 is given below :

There are 11 numbers from 10 to 20. They are 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 and 20.

We know that a number that is not divisible by 2 is an odd number.

So, out of the above-mentioned numbers, the odd numbers are :

11, 13, 15, 17, and 19.

So, there are 5 odd numbers out of the 11 given numbers from 10 to 20.

So, required fraction = 511

Regards

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