How many combinations of 3 numbers are there in 7 numbers?

Answer 1

There are 7 choices for the first place. That leaves 6 choices for the second place and that leaves 5 choices for the third place.

So seven times six times five is 210 This assumes each number can only be used once.

Now lotteries where the player chooses numbers, say, six numbers out of 40, usually arrange the numbers in ascending order so a lot of combinations are eliminated.

For example, 123, 231, 321, 312, 132,213 are all possible combinations of three digits but to the lottery machine they are all the same as 123

In lotteries where a number is preprinted on the ticket, that number retains its original order so 123 is not the same as 213 or 321

Numbers games can be based on some unknown number like the number of letters in the headline of tomorrow`s newspaper.

what ever the game, the odds are usually against the player.