You are randomly picking a number between 1 and 20, inclusive. What is the probability of selecting an odd number?

So we know that if we start with an odd number and end with an even or we start with an odd and we end with an even, that means that half of the numbers are odd.

We can even count - 1, 3, 5,  7,  9, 11, 13,15, 17, 19 - 10 which is half.

So since half of the numbers are odd that means that

Odd numbers between 1 and 20 (inclusive): 1, 3, 5, 7, 9, 11, 13, 15, 17, 19

Number of odd numbers: 10

Total numbers: 20

Probability of picking an odd number = 10/20 = 1/2 or 50%

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