Question

if x={xx is a prime number which is less than 15} y={y:y is a multiple of 7,7≤y≤30} then find n(x)and n(y) and n(x-y)​

Answer 1

Step-by-step explanation:

x={2,3,5,7,11,13}. n(x)=6. y={ 7,14,21,28}. n(y)=4 n(x-y)=n(x)-n(x intersection y). (x intersection y)={7}. n(x intersection y)=1. n(x-y)=n(x)-n(x intersection y)=6-1=5. n(x-y)=5