What is the probability of guessing a 3 digit number?

If you include the one and 2 digit integers with enough zeros prepended to make them 3 digit, then your possibilities range from 000 to 999, which would give you 1,000 different 3-digit integers. With that your chances of guessing the right one would be 1/1000 or 0.001.

How many combinations are possible with 5 digits?

Assuming no five-digit number can begin with zero, there are 9 possible choices for the first digit. Then there are 10 possible choices for each of the remaining four digits. Therefore, you have 9 x 10 x 10 x 10 x 10 combinations, or 9 x 10^4, which is 90,000 different combinations.

How many probabilities are possible with 3 numbers?

There are, you see, 3 x 2 x 1 = 6 possible ways of arranging the three digits. Therefore in that set of 720 possibilities, each unique combination of three digits is represented 6 times. So we just divide by 6. 720 / 6 = 120.

What are the odds of guessing a lock combination?

Since there are 59280 different possible locker combinations, one might naively guess that for 1000 students, the probability that two have the same locker combination is about 1 in 59.

How many combinations of 3 numbers can you make with 5 numbers?

So 5 choose 3 = 10 possible combinations.

How many combinations of 3 numbers are there?

There are exactly 1,000 possible combinations for a 3-digit code. There are 10,000 combinations possible for a 4-digit code.

How many different three number combinations are possible on a combination lock having numbers on its dial?

How many combinations of three number codes can occur with a standard combination lock? The range of possible numbers is 0-39 which allows 40 different possible choices each turn of the dial. Each combination requires exactly three numbers (i.e. three turns of the dial).

What is NCR formula?

The combinations formula is: nCr = n! / ((n – r)! r!) n = the number of items.

How many of the three digit numbers are divisible by 5?

180 three digit numbers
Hence there are 180 three digit numbers divisible by 5.

What is the probability of picking three distinct digits?

(1) The “probability of picking three distinct digits when you pick three digits” is (1)(9/10)(8/10)= 72/100= 0.72. The “probability that the number chosen, when choosing three distinct numbers is a specific such number is (1/10)(1/9)(1/8)= 1/720.

How do you calculate 3 digit numbers with exactly one digit as 5?

To calculate the 3 digit numbers with exactly one of its digit as 5, we need to use permutation and combination. Case 2) B=5, thus C be any digit but 5 while A can be any digit but 0 & 5. A cannot be 0 as it will violate the rule of being a 3 digit number. 8 clever moves when you have $1,000 in the bank.

What is the probability that you will guess it in 3 tries?

Aug 4 ’14 at 13:48 2 $\\begingroup$And because (answers below), the number of possibilities is equal to 360, the probability that you will guess it in three tries is equal to $1-(1-1/360)^3 ≈ 0.83\%$ (assuming you guess randomly.

What is the probability of getting the PIN code on 3 tries?

Using Bernoulli trials formula: The probability of guessing the PIN code in exactly the third try is: (1/360)^3. But the probability of guessing the PIN code in exactly one of 3 tries is: 3* (359/360)^2* (1/360)