Question

If a is an integer and b is a natural number, is the conjecture that a + b is positive, true?
Show working by choosing different combinations of integer / natural numbers for a and b to test

Answer 1

Natural numbers are b ={0,1,2,3,...}
Integer numbers are a={...,-3,-2,-1,0,1,2,3,...}
false, because if a = -3 and b = 1 then a+b=-2