It depends on the number of possibilities for each number, a piece of information that you did not provide. Please restate the question.
The generalized answer, however, is 1 in the number of combinations of N things taken M at a time, M in this case being 7, and that number is N! / (M! (M-N)!).
As an example, if M were 50, then the number of combinations of 50 things taken 7 at a time is 50*49*48*47*46*45*44/7/6/5/4/3/2, or 99,884,400. In this case, the odds would be 1 in 99,884,400 or about 0.000000010011573379.
Chat with our AI personalities
Chance of winning: 12.5%
999,993 in 1,000,000.
Here are the odds in craps: 7 vs. 6 Odds: 6 to 5 7 vs. 5 Odds: 6 to 4 or 3 to 2 7 vs. 4 Odds: 6 to 3 or 2 to 1 7 vs. 3 Odds: 6 to 2 or 3 to 1 7 vs. 2 Odds: 6 to 1
Two. The 5 and 7 are odd numbers. The 2 is an even number.
The odds of choosing a prime number in the set [1-20] are 8 out of 20, as there are 8 prime numbers, 2, 3, 5, 7, 11, 13, 17, and 19, in that set.