Table of Contents
- 1 What is the probability of two digits being same?
- 2 How do you know if a 2 digit number is prime?
- 3 What is probability that two digit number selected at random will be multiple of 3 as well as 5?
- 4 How many 2 digit primes are there?
- 5 What is the probability of having a prime number between 2-100?
- 6 What is the probability of an odd 2 digit number?
What is the probability of two digits being same?
Therefore, 1/10 is the probability of both the digits being same.
How do you know if a 2 digit number is prime?
It boils down to this: a two digit number is prime if it’s not divisible by any of 2, 3, 5, or 7.
What is the probability of the first digit being smaller?
Answer: The probability is 2/5. Event A is the event in which the probability of getting the number with first digit being smaller.
How many two digit numbers are there?
90
The total number of two digit numbers is 90. From 1 to 99 there are 99 numbers, out of which there are 9 one-digit numbers, i.e., 1, 2, 3, 4, 5, 6, 7, 8 and 9. If one digit numbers are subtracted from 99 we get 90 two-digit numbers.
What is probability that two digit number selected at random will be multiple of 3 as well as 5?
Hence, the required probability is 24/90 = 4/15.
How many 2 digit primes are there?
∴ There are “9” two-digit prime numbers are there between 10 to 100 which remain prime numbers when the order of their digits is reversed….4.6.
| 11 | |
|---|---|
| 13 | 31 |
| 79 | 97 |
What is the probability of the first digit being larger?
Answer: the probability of getting the larger number at first is 1/2……
What is the probability of only one of the digit being one?
For example, most numbers in a set (about 30\%) will have a leading digit of 1, when the expected probability is 11.1\% (i.e. one out of nine digits).
What is the probability of having a prime number between 2-100?
There are 25 Prime numbers between 2–100. 1 is not considered to be a prime. so that leaves a number set of 2–99 or 25 Prime and 73 non Prime or 98 number in total numbers. So the probability would be 25/98 or 25.5\%. , Analyst programmer for years, but I love mathematics.
What is the probability of an odd 2 digit number?
An odd 2 digit is one where the last digit is either 1,3,5,7 or 9. Therefore there are 9 digits in the 2nd slot x 5 numbers in the 1st slot = 45 odds. There are 99–76 + 1 = 24 numbers larger than 75. Therefore the probability is 24/90.
How many prime digits are there in 4^x?
Recommended: Please solve it on “ PRACTICE ” first, before moving on to the solution. There are four prime digits 2, 3, 5 and 7. First observation is that the number of numbers of x length and made of prime digits are because for each position you have 4 choices so total number is 4^x.
How many two-digit prime numbers are there?
We are trusted by Amazon, Tencent, and MIT. There are 90 two-digit numbers, from 10 to 99. Examine each in turn, and count the number of primes. Subtract the number of primes you have just counted from 90, and divide the result by 90.