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

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=

State which of the following sets are finite sets or infinite. In case of finite set, mention the order of cardinal number (i) A=("x:x is a prime number and "x lt 15) (ii) B=(x:x in N, and 3x+2=11) (iii) C=(x:x in N and x^(2)-14x+3=0) (iv) D=(1,2,3,4....)

If A={x:x is prime number,x<7),B{x:x is even number,2<=x<=8},C={x:x is natural number and x<5} Then find A+B and A nn(B-C)

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

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?

If U={x:x<=10,x in N} is the Universal set, A={x:x in N,x is prime number } and B={x:x in N, x is even} write A n B in roster form.

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

The contrapositive statement of the statement "If x is prime number, then x is odd" is