1/20 = 5%
The probability is 1 over 20.
Oh, dude, the probability of guessing the last digit of a phone number is 1 in 10, because there are 10 possible digits (0-9). So, like, if you randomly guess, you have a 10% chance of getting it right. But hey, don't stress about it too much, it's just a phone number!
The probability is 1/2.
The probability is 1/2.
a long number
It is 0.45
It is 4/9
On a number line, the digits from 10 to 99 are all two digit numbers. How many numeber are that? There is a short cut. You can subtract 10 from 99 and that gives you the number of numbers between 10 and 99 including 10, but you need to add one more to include 99 as well. So, 10 from 99 is 89 adding 1 is 90 ,which is the amount of numbers total that are two digit. The probability of guessing a two digit number is 1/90 =D
.9
thirteen, thirty
The probability of guessing a 4-digit numerical code is 1:10000. If the code can contains numbers AND letters - that figure rises to 1:1,679,616
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