A three-digit number is selected at random from the set of all three-digit numbers. The probability that the number selected has all the three digits same is `1//9` b. `1//10` c. `1//50` d. `1//100`

Three distinct numbers are selected from first 100 natural numbers. The probability that all the three numbers are divisible by 2 and 3 is -

How many three-digit numbers are divisible by 7?

A mapping is selected at random from the set of all the mappings of the set A={1,2,...,n} into itself. Find the probability that the mapping selected is an injection.

What is the probability that a number selected at random from, 1, 2, 3,...., 100 has a digit 4?

Find the sum of all three-digit natural numbers, which are divisible by 7.

Number 1, 2, 3, ...100 are written down on each of the cards A, B, and C. One number is selected at random from each of the cards. Then find the probability that the numbers so selected can be the measures (in cm) of three sides of right-angled triangles, no two of which are similar.

A natural number is chosen at random from the first 100 natural numbers. The probability that x+(100)/x > 50 is 1//10 b. 11//50 c. 11//20 d. none of these

A five digit number is formed with the digits 1,2,3,4,5 without repetition. Find the probability that the number is divisible by 4.

The number of different 6-digit numbers that can be formed using the three digits 0,1,2 is

Find the probability that a randomly chosen three-digit number has exactly three factors.