Question # If ( A ) is the set of the divisors of the number ( 15, mathrm{B} ) is the set of prime numbers smaller than 10 and ( C ) is the set of even numbers swaller

# If ( A ) is the set of the divisors of the number ( 15, mathrm{B} ) is the set of prime numbers smaller than 10 and ( C ) is the set of even numbers swaller

than ( 9, ) then ( (A cup C) cap B ) is the set

( begin{array}{llll}text { 1) }{1,3,5} & text { 2) }{1,2,3} & text { 3) }{2,3,5} & text { 4) }{2,5}end{array} )

Solution

( A={1,3,5,15} )

( B={2,3,5,7} )

( C={2,4,6,8} )

( therefore quad A cup C={1,2,3,4,5,6,8,15} )

( (A cup C) cap B={2,3,5} )