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Two adjacent numbers

Question

How often does a draw of lotto numbers include two adjacent numbers?

Check

It will change with the numbers you have to pick from, and how many numbers you must pick, but here is a list from doing 10 millions draw each time

For 34 numbers where you pick 7 (standard norwegian lotto)

run	percentage
1	77
2	78
3	78
4	78
5	77

So we see the probability should be between 77 and 78.

For 48 numbers where you pick 6 (standard norwegian viking lotto)

run	percentage
1	50
2	50
3	50
4	50
5	50

So we see the probability should be about 50.

Answer

For picking 7 numbers out of 34 there is a probability about 77.5% to get adjacent numbers.
For picking 6 numbers out of 48 there is a probability about 50% to get adjacent numbers.

Source

GitHub