Question

Let p & q be the number of natural numbers which are less than or equal 30 and are prime & composite respectively​

Answer 1

$Total no. of prime no. \: =p=8 </p><p>" " " composite no. \: =q=11 </p><p>therefore \: , 20-p-q = 20-8-11 \: =1 </p><p>so ans is 1$