Question

Four chips are distinctly labeled with the digits 2, 3, 1 and 7, one chip for each digit. Two chips are drawn at random without replacement and placed in the order which they are drawn, from left to right, to form a two-digit number. What is the probability that the two-digit number is a prime number? Express your answer as a common fraction

Answer 1

sample space is 12.5 of them are composite no.s.so 7 is prime.so,,,answer is 7/12