Numbers 16, 17, 18, ... , 55 are written on separate slips (one number on one slip), kept in a bag and mixed well. One slip is chosen from the bag without looking into the bag. What is the probability that the number on the chosen slip is a prime number between 19 and 53?

Which is not formed by multiplying two consecutive primes?

Four prime numbers are arranged in ascending order. The product of first three numbers is 255 and the product of last three numbers is 1955. The largest prime number is

The smallest prime number is -

For any three distinct prime numbers, all greater than 13, which of the following is NOT true?

The number of 2-digit prime numbers in which digits are also prime is:

Which of the following is a pair of co-prime numbers?

The product of the smallest prime number and the smallest composite number is …………..

Which of the following is a prime factor of 54?

Which of the options below gives a pair of co-prime numbers?

Three numbers which are co-prime to each other are such that the product of the first two numbers is 143 and that of the last two numbers is 195. The sum of the three numbers is________