LetA={x/x is a prime number and x<30 ).The number of rational numbers whose numerator and denominator belong to A is of the form `10a+1` then `a= `

If A={x|x is prime number and x<30} find the number of different rational numbers whose numerator and denominator belong to A.

Let A={x:x is a prime number less than 10} and B= {x:x in N and 0 lt x -2 le 4} then A-B is

Let A ={x:x is a prime number less than 10} and B={x:x in N, x "is a" factor of 12} . Find A cup B .

If C={x:x is an odd number}, D = {x:x is a prime number}, then C nn D =

Write the following set in roster form A ={x|x is a prime number , 1 lt x lt 20 }

Let A= {x:x is natural number}, B= {x:x is an even natural number}, C = {x:x is an odd natural number}, D= {x:x is a prime number }. Find (i) AcapB (ii) AcapC (iii) AcapD (iv) BcapC (v) BcapD (vi) CuuD .

A = {x:x is a prime number}, Set A is ............ set. (Finite, Null, Infinite)

A = {x|x is a prime numbers le 100} B = {x| x is an odd numberc le 100} What is the ratio of the number of subsets of set A to set B?