Question

B = { x ∈ N | x= 2p + 3,p ≤ 3,p ∈ N}

Answer 1

p=0,1,2,3
x=2x0+3=3,p=0
p=1,x=2x1+3=5
p=2,x=2x2+3=7
p=3,x=2x3+3=9
B={0,5,7,9}